Xorg black screen after monitor power off, AMD r9 270X & aoc u2868pqu

Is there a way to get xorg to reset its video settings, and how are we getting more debug messages out of xorg these days?
(not any kind of emergency as everything is "working")
when I power off my monitor for a few minutes xorg goes completely black.
I can switch to other TTYs and start a second xorg from there
When I try to get back to the original TTY that xorg's still black.
these messages show up on the second TTY
<code>[34181.758006] [drm:si_dpm_set_power_state [radeon]] *ERROR* si_restrict_performance_levels_before_switch failed
[34181.835519] [drm:radeon_dp_link_train [radeon]] *ERROR* displayport link status failed
[34181.835526] [drm:radeon_dp_link_train [radeon]] *ERROR* clock recovery failed
[34181.838937] [drm:radeon_dp_link_train [radeon]] *ERROR* displayport link status failed
[34181.838942] [drm:radeon_dp_link_train [radeon]] *ERROR* clock recovery failed</code>
nothing looks relevant in
~/.local/share/xorg/*
these messages also show up if I turn off the monitor when positioned on a console, but the console is still accessible on monitor power up.
none of these show up if I turn off the monitor when positioned on a KMScon, and the KMScon is still accessible on monitor power up.

Similar Messages

[SOLVED] Black screen after GRUB

Hello everyone
I was setting up a machine with E17 and was trying various DM's since none seemed to work. After attempting to use LightDM, I get a black screen after GRUB. I was trying to read the various logs at /var/log/ but I cannot understand them properly. I tried reinstalling entrance and LightDM with no luck. I even tried editing grub's entry appending '1' or 's' and still no dice. Any help would be appreciated.
Last edited by Linoman (2014-01-20 09:22:33)

Hi tnx for both answers.
I missed something important in Xorg.log. As you can see, fbdev and modesetting aren't loading as usual. I didn't check grub stuff, I don't think it's related, since loading in level 3 (text mode) I get a black screen but I can login as root and turn off the computer blindlessly.
[ 2.969] (II) LoadModule: "modesetting"
[ 2.969] (WW) Warning, couldn't open module modesetting
[ 2.969] (II) UnloadModule: "modesetting"
[ 2.969] (II) Unloading modesetting
[ 2.970] (EE) Failed to load module "modesetting" (module does not exist, 0)
[ 2.970] (II) LoadModule: "fbdev"
[ 2.970] (WW) Warning, couldn't open module fbdev
[ 2.970] (II) UnloadModule: "fbdev"
[ 2.970] (II) Unloading fbdev
[ 2.970] (EE) Failed to load module "fbdev" (module does not exist, 0)
[ 2.970] (II) intel: Driver for Intel(R) Integrated Graphics Chipsets:
i810, i810-dc100, i810e, i815, i830M, 845G, 854, 852GM/855GM, 865G,
915G, E7221 (i915), 915GM, 945G, 945GM, 945GME, Pineview GM,
Pineview G, 965G, G35, 965Q, 946GZ, 965GM, 965GME/GLE, G33, Q35, Q33,
GM45, 4 Series, G45/G43, Q45/Q43, G41, B43, HD Graphics,
HD Graphics 2000, HD Graphics 3000, HD Graphics 2500,
HD Graphics 4000, HD Graphics P4000, HD Graphics 4600,
HD Graphics 5000, HD Graphics P4600/P4700, Iris(TM) Graphics 5100,
HD Graphics 4400, HD Graphics 4200, Iris(TM) Pro Graphics 5200
[ 2.970] (II) VESA: driver for VESA chipsets: vesa
[ 2.970] (++) using VT number 7
[ 2.974] (WW) Falling back to old probe method for vesa
javex wrote:Post the content of the following files:
Also does disabling LightDM again help resolve the issue, i.e. can you get it to work without LightDM?
No, I can't get it to work changing DM's. I'm not sure if I pacman -Syu before changing DM's another time. Maybe it wasn't LightDM's fault afterall.
Spider.007 wrote:Additionally; try booting without the 'quiet' entry that is in the kernel line by default; and disable https://wiki.archlinux.org/index.php/Ke … de_Setting too
Thanks for pointing out that. I didn't knew I had it on.
Last edited by Linoman (2014-01-11 21:34:08)

Black Screen after logging in locally to Windows 7 that previously had an open RDP session.

Here is what happens. I leave my home computer on (running Windows 7 Ultimate) and sometimes I will remote to it from another location (work, friends house, or wherever). When I return home, I will go to login, the screen then goes blank (no mouse cursor
or anything). I have to do a cold boot to get back into Windows. This only happens if I ever RDP into it sometimes during the day. It seems random. I've tried logging off the RDP session, just closing it without logging off, nothing seems to be the answer
in that regard. It seems very random at times. I'll go a week and I can come home and it will login fine with no problems. Then the next week it starts giving me the black screen after I come home and login locally. I've seen several black screen issues here,
but usually they are getting it before logon. Anyone have a clue what might be causing this?

Hello,
The Windows Desktop Perfmon and Diagnostic tools forum is to discuss performance monitor (perfmon), resource monitor (resmon), and task manager, focusing on HOW-TO, Errors/Problems, and usage scenarios.
As the question is off topic here, I am moving it to the
Where is the Forum... forum.
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[Solved] Amilo XI 2550 - Black screen after fresh install

Dear archlinux users,
I have been reading the archlinux wiki and forums since I started using arch several years ago. It was always possible to solve the problems I ran into by consulting these webpages, therefore a big thanks to the community for the provided help.
Two weeks ago I installed arch on a Fujitsu Siemens Amilo XI 2550. The first problem I ran into was that booting the live-cd resulted in a black screen and I could not even start with installing arch. This problem was solved with the kernel parameter 'nomodeset'.
The first boot of the freshly installed arch also resulted in a black screen after the GRUB menu which was perfectly displayed. After some searching (here and here and ...) I plugged in an external monitor and it showed the login screen. I then installed KDE because I thaught the problem might not show up with X and KDE running. After the login to KDE I realized that the brightness of the laptop display is nearly black but not totally. It seems as if the brightness is at a very low level, but brightness cannot be controlled with the Fn+F8 or Fn+F9 commands. But I see a OSD that indicates that the controls are used but without effect. So at the moment it is only possible to work on the laptop with another display connected to it.
Maybe of use:
ls /sys/class/backlight/
acpi_video0
radeon_bl0
less /sys/class/backlight/acpi_video0/bl_power
0
less /sys/class/backlight/acpi_video0/actual_brightness
7
less /sys/class/backlight/acpi_video0/brightness
7
less /sys/class/backlight/acpi_video0/max_brightness
7
less /sys/class/backlight/radeon_bl0/bl_power
0
less /sys/class/backlight/radeon_bl0/actual_brightness
255
less /sys/class/backlight/radeon_bl0/brightness
255
less /sys/class/backlight/radeon_bl0/max_brightness
255
dmesg | grep drm
[ 0.736559] [drm] Initialized drm 1.1.0 20060810
[ 0.743608] [drm] radeon kernel modesetting enabled.
[ 0.743678] fb: switching to radeondrmfb from VESA VGA
[ 0.744054] [drm] initializing kernel modesetting (RV630 0x1002:0x9583 0x1734:0x1107).
[ 0.744065] [drm] register mmio base: 0xCFEF0000
[ 0.744067] [drm] register mmio size: 65536
[ 0.744172] [drm] Detected VRAM RAM=256M, BAR=256M
[ 0.744174] [drm] RAM width 128bits DDR
[ 0.744257] [drm] radeon: 256M of VRAM memory ready
[ 0.744259] [drm] radeon: 512M of GTT memory ready.
[ 0.744275] [drm] Loading RV630 Microcode
[ 0.744345] [drm] Internal thermal controller without fan control
[ 0.744386] [drm] radeon: power management initialized
[ 0.744389] [drm] GART: num cpu pages 131072, num gpu pages 131072
[ 0.762830] [drm] PCIE GART of 512M enabled (table at 0x0000000000040000).
[ 0.762873] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 0.762874] [drm] Driver supports precise vblank timestamp query.
[ 0.762937] [drm] radeon: irq initialized.
[ 0.794780] [drm] ring test on 0 succeeded in 1 usecs
[ 0.795253] [drm] ib test on ring 0 succeeded in 0 usecs
[ 0.795942] [drm] radeon atom DIG backlight initialized
[ 0.795945] [drm] Radeon Display Connectors
[ 0.795947] [drm] Connector 0:
[ 0.795948] [drm] LVDS-1
[ 0.795950] [drm] DDC: 0xac0 0xac0 0xac4 0xac4 0xac8 0xac8 0xacc 0xacc
[ 0.795951] [drm] Encoders:
[ 0.795952] [drm] LCD1: INTERNAL_LVTM1
[ 0.795953] [drm] Connector 1:
[ 0.795954] [drm] DIN-1
[ 0.795955] [drm] Encoders:
[ 0.795956] [drm] TV1: INTERNAL_KLDSCP_DAC2
[ 0.795957] [drm] Connector 2:
[ 0.795958] [drm] HDMI-A-1
[ 0.795960] [drm] HPD1
[ 0.795961] [drm] DDC: 0x7e50 0x7e50 0x7e54 0x7e54 0x7e58 0x7e58 0x7e5c 0x7e5c
[ 0.795963] [drm] Encoders:
[ 0.795964] [drm] DFP1: INTERNAL_KLDSCP_TMDS1
[ 0.795965] [drm] Connector 3:
[ 0.795966] [drm] VGA-1
[ 0.795968] [drm] DDC: 0x7e40 0x7e40 0x7e44 0x7e44 0x7e48 0x7e48 0x7e4c 0x7e4c
[ 0.795969] [drm] Encoders:
[ 0.795970] [drm] CRT1: INTERNAL_KLDSCP_DAC1
[ 1.278449] [drm] fb mappable at 0xD0141000
[ 1.278451] [drm] vram apper at 0xD0000000
[ 1.278453] [drm] size 9216000
[ 1.278454] [drm] fb depth is 24
[ 1.278455] [drm] pitch is 7680
[ 1.278527] fbcon: radeondrmfb (fb0) is primary device
[ 1.726069] radeon 0000:01:00.0: fb0: radeondrmfb frame buffer device
[ 1.770030] [drm] Initialized radeon 2.39.0 20080528 for 0000:01:00.0 on minor 0
Until now and amongst others I tried the following things.
Using kernel parameters
video.use_native_backlight=1
video.use_native_backlight=0
acpi_osi=linux
acpi_backlight=vendor
and others I just cannot remember.
Masking backlight
systemctl mask systemd-backlight@backlight:acpi_video0.service
systemctl mask systemd-backlight@backlight:radeon_bl0.service
Setting bl_power
echo 1 > /sys/class/backlight/acpi_video0/bl_power
echo 1 > /sys/class/backlight/radeon_bl0/bl_power
Nothing of the above was improving the situation.
Your help on the problem would be highly appreciated.
Best regards
mgs
Last edited by mgs (2014-10-27 10:15:11)

Hello Trilby,
thanks for the reply.
Trilby wrote:If nomodeset worked with the installation medium, why haven't you tried that for the same problem on your installed system?
The kernel parameter 'nomodeset' results in a working display but without X support, due to the fact that with 'nomodeset' there is no KMS support and therefore no X. But nevertheless I tried it and as expected X did not start.
Trilby wrote:Could you also post information about your graphics card and what drivers you've installed.
The graphics card is a Radeon HD 2700 and according to the above dmesg log it is recognized as RV 630. The radeon module is loaded via /etc/mkinitcpio.conf and xf86-video-ati (1:7.5.0-1) is installed.
I hope the provided information is what you asked for, thanks for your help.
Best regards
mgs

HP Pavilion DV3 41700-EE Problem-Black Screen after installing graphic card driver

Hi,
Laptop Model : HP Pavilion DV3 41700-EE Entertainment series.
I download the latest official driver for my lap top from this link : http://h10025.www1.hp.com/ewfrf/wc/softwareDownloadIndex?softwareitem=ob-93326-1&cc=us&dlc=en&lc=en&...
After the installation i rebooted my device and after the windows loading i got a black screen ! i went to safe mode and unistall the video card and also it's driver from device manager and when i came back the black screen was gone but i have only my onboard Integ graphic which is very slow.
also i went to AMD web site and get AMD Catalyst from their web site but nothing happened after the installation and i think they don't provide an appropriate driver for my lap top.
i also tries to go to device manager and with right click on my display adapter and update driver point to the display driver location on my syste but this time it does not take time the black screen after restart, and in the middle of installation i got a black screen.
Also i upgraded my BIOS Firmware from 16 to 24, but nothing changed.
i just wanna know is it a software problem or hardware problem ? how can i find out that ?
also i don't want this switchy manner and i don't care about the power efficency. i just want to my device work on maximum performance.
What you suggest i do ?

Use the recovery manager to reinstall the original AMD graphics driver and Catalyst Control center.
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Black screen after startup - Satellite A105-S4334

it gives me black screen after windows logo display right after the appearance of the cursor, and nothing i can do except hold on the "Turn off" button, and then restart again, it shows the menu to whether to start in safe mode ... network mode ... normally or lastest know good windows start ....
when it starts for the second time it works fine, it does this all the time and now i'm reinstalling windows for the 2nd time (factory-state) any solution or explanation for this issue?

no, i didn't, nothing connected to it yet.
what trials i did:
i reinstalled my own windows XP and it didn't show this, but because the PowerSaver error msg. and returned back to the manufactuer state CD, and same black error occurs.
Notices:
1- when i do restart it doesn't happen
2- right away after it happens and hold on the power button till it shuts down and turn it on again, and it works fine.
3- i don't know is this has nothing to do with DVD/CD rom message comes after start up asking to disable DVD-Ram option or not? but i always answers NO
hope these info helps you helping me :)

Black Screen after computer boots to Win XP With NX6600 VTD 256

My son recently purchased a new computer and gave his old one to me to salvage what I wanted.Since he just a few months ago purchased my NX6600 VTD 256 from me I naturally salvaged that first. I tried to install the NX6600 in my other son's computer without success. First the particulars:
MSI 845 Pro2 Mobo, 512 mb 133 Mhz Ram, 1.7 Ghz Intel CPU, Aopen AO350 12A PNF power supply, 350 watts with 18 amps on the 12 volt rail.
I did a fresh install of winXP on a freshly formatted HDD. Installed service pack 2, the latest intel drivers, and 5 different versions of the driver packages including ver 77.77 all with the same results.
After the computer boots I am intermittantly faced with a black screen after the WinXP logo disappears. This sometimes happens 3 times in a row before I get a working screen. After a good boot the NX6600 benchmarks good with very good marks!
I am at this point strongly suspecting the power supply is not up to the task, even though the specs for the NX6600 recommend a 350 watt power supply. Before I start removing all the hardware from the computer except for the NX 6600 to see if I have a hardware conflict, I doubt this because with the NX6600 installed without drivers I get a good boot every time.
I'm open for suggestions.

Thanks for the reply boss killer.
I tried what you suggested with a CRS power supply 300 watts with 15 amps on the 12 volt rail.
with the exact same results.
I then put the crs powersupply back into #1 son's old case reinstalled the nx6600 and gave it a go
Particulars for the old computer ECS K7VTA3 ver. 1 Mobo with 512 Mb DDR, nx6600VTD256 vid card and the CRS Power supply 300 watts with 15 amps on the 12 volt rail , and win XP pro service pack 2.
Funny the card works great without any problems with this setup! And the powersupply is 50 watts less and only 15 amps as compared to the other with 18!
I then pulled all the hardware out of #2's computer and tried it with only the memory, cpu, and NX6600 connected.
I had to boot 5 times before I had a working screen.
Now I'm thinking that there is somthing amiss with the NX6600 and the MSI 845 Pro2 ???
I'm thinking that I would be better off installing the K7VTA3 in #2 son's computer with the NX6600, since this works fine. When I did a benchmark with this setup it outperformed the *45 Pro 2 NX6600 combination By 300 points 2600 as compared to 2300 aqua mark points.
Isn't this fun?

MSI R9 270X - Black Screen after Win7 logo

Hello there.
About a week ago I upgraded my PC, buying several components and putting it to work. Here's the specs.
Main Board: M5A97 EVO R2.0
Bios Version: Latest
Video Card: MSI Radeon R9 270X TwinFrozr OC Edition 2Gb
PSU: Don't know
12v rail Rating of listed PSU:
CPU: AMD FX 8350 4.0Ggz BE SkAM3+
Memory: 8Gb Crucial Ballistix DDR3-1600Mhz
SSD/ HDD: Western Digital WD10EZRX-00A8LB0 1TB
CPU COOLER: The one that came with the CPU
Raid Card: Onboard
Sound Card: Onboard
OC: (Yes / No) Don't know
Operating System: Win 7 SP 1 64
So, it worked just fine for about 3 days. Last Saturday night I tried to open Google Chrome after some gaming and the the system froze. I got a screen with vertical black and white stripes. I had to reboot the system and it gave me a black screen, crashing again, after the Win Logo at start up. At this time I was running either 14.7 or 14.9 ATI drivers.
I could only start the PC on Safe Mode. Removing the drivers and getting Windows general VGA card settings would allow me to use Windows in normal mode though. Once I installed the Graphic Card's drivers it crashed on reboot, always with the black screen after Win logo. I installed several ATI drivers, namelly 14.9, 14.11 beta, 13.12... and nothing worked.
I flashed the Mother Board BIOS to the latest version, formatted the HDD doing a fresh install of Win 7, installed Catalyst first and then the drivers, the drivers without catalyst, etc. and nothing worked, always getting a black sreen on reboot once the Graphic Card's drivers were installed. I even swapped the Graphic Card to a different slot to no avail.
Right now I'm using my old Radeon HD 5670 with the latest drivers and everything works just fine. It even works fine if I keep both Graphic Cards installed with the monitor plugged to the older card. I find this odd since to do so, Windows loads both cards drivers with no errors. But once I switch to the new card everything goes black.
Can someone help me out? I've tried to contact my vendor's technical support through mail but they're not answering. I fear that I'll have to report it as DOA and swap it out, which will take quite some time taking into consideration the way things tend to work around here.
EDIT - I don't have a 2nd system to test it on.

Nope. Not driver issue at all. I tested at least 3 different drivers, all with the same result. Besides, I used both Driver Fusion and Driver Cleaner and CClean to remove any non-deleted registry entries. Always got the same problem. Went as far as formating the drive and doing a clean Win install. The problem persisted.
Tried installing drivers without Catalyst to no avail. Tried installing Cataltst first and then the drivers. Nothing. It always crashed omce the drivers were installed.

My Imac 24" goes black screen after start up. Booting from original CD or CMD R don't work, both go black screen

So, yesterday while playing a game of league of legends my Mac stopped running. After I resetted it, I got black screen after it the chime + loading bal.
So far I've tried:
CMD+R => black screen
Holding shift => black screen
Holding Alt => chosing the HR, the repair disk, or the original CD to reintsall => black screen
Holding S => got to the terminal, did the check up, it said it was ok, restarted => black screen
Took off the power cable, waiting at least 15 seconds, and everything back on => black screen
Holding Alt Cmd + p + R => black screen after restart
Removed 1 of the memories, then testen, same with the other one => black screen
I'm pretty much out of ideas at this point. Anything I've overlooked?

Any white text?
Startup - Black Screen/White Text
Startup – Red Screen
Startup Issues - Resolve
Startup Issues - Resolve (2)
Startup Issues - Resolve (3)
Restart the computer holding down the command - option/alt - P - R keys before the grey screen appears. Continue to hold until you hear the startup chime for the second time.
Reset NVRAM/PRAM
Try a SMC reset. The article covers when this is required, but doing this will not affect anything.
Reset SMC

Black screen after windows auto update

New laptop in use for 3 weeks. After Windows auto update restart I get to splash screen and am able to enter Windows password to log onto desktop. After successfully entering password I am not able to view my desktop; I get the black screen with cursor function; cursor disappears when moved within an inch of left or right of screen (seems to go behind something). I believe I am at the desktop but just not able to view it, because I receive app popups on the black screen (need to update McAfee, etc).
In safe mode I restored to pre auto update date; manually installed all Windows updates; worked fine until NEXT auto update, same problem.
Graphics Card: Stock Intel HD Graphics
Monitor: Generic PnP
Why would it be fine with the manual update and not after auto update?
I do not have an external monitor to attach this laptop for diagnosis. I have run windows partition checks and hard drive partition checks with no issues to resolve.
I did get an error message once when running a diagnosis (can't remember which) : Windows Update Error 0x80070490
No real luck finding anyway for me (the average Joe) to resolve this issue.
If this is a harddrive issue I don't want to keep pussyfooting around while my warranty window shrinks.
I have downloaded driver updates from HP, but cannot get the Synaptics Touchpad driver to download. I don't think this is my issue though.
I am going to manually update all my drivers then manually update Windows. We will see what happens on the next auto update.
Please advise if this is an issue I need to just give up on and return this laptop for replacement. It seems like this is not a completely unheard of issue, but I'm shocked at what we are asked to do to attempt to resolve it. Out of my depth.

Hi @Justanothermom
Welcome to the HP Support Forums!
I understand that you are having troubles with a black screen after an update. I am happy to help you with this.
Firstly, there is nothing wrong with modifiying your update settings. I was going to suggest it myself as I read through your post, and then saw you ask the question. Sometimes updates can have unintended results by the creator. With all the different combinations of hardware, and the fact that updates come from different sources, it is one of those things that is hard to completely control.
Please see the following for how to make adjustments to your update settings.
Turn automatic updating on or off - windows.microsoft.com
Or if you know which update seems to be causing the issue you can take a look at this page:
win 8.1 August 12 updates - black screen after 2nd reboot - answers.microsoft.com
Let me know if this helps at all.
Malygris1
I work on behalf of HP
Please click Accept as Solution if you feel my post solved your issue, it will help others find the solution.
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Black Screen After Boot up

My T420s (2 months old) recently has been giving me a black screen after boot up (no "Thinkpad" image is displayed during boot up). System totally unresponsive -- I have to push on/off button multiple times. Subsequent boot up usually OK. Sometimes once I'm up and running, upon entering sleep mode, the machine will not wake up.
I have adjusted power management setting and and up-to-date on all drives. HELP!!!

if this is constantly occurring this would mean something is wrong with the Thinkpad's hardware, since this laptop is fairly new, you should consider getting it fixed under warranty.
Regards,
Jin Li
May this year, be the year of 'DO'!
I am a volunteer, and not a paid staff of Lenovo or Microsoft

M5400 - Black screen after updating BIOS

As the title says, I've got this unwanted black screen after updating BIOS with update utility from here http://support.lenovo.com/us/en/downloads/ds037429
What I've tried :
- power / battery out, pressing power button several times for short / long and longer time
- BIOS battery out for about half an hour
- wincrisis with USB bootable stick and BIOS extracted from BIOS update utility from support.lenovo
- different combinations of keys such as : FN + B / F / R +/- win key
What should I do next except finding a hammer ?

Hey,
I am having the same problem, I was updating my bios.. followed all directions which is necessary to update them.
And then when it was almost ready it said "Bios update is not responding" so I waited... and waited because I did not want to abort it but then Vista aborted it for me.
Well at first it did not seem to be a problem but then I noticed that I could not click anything (was still in windows @ that time did not reboot yet) then I wanted to reboot but nothing worked.. Pressing off button for a time to shut down did not work.. So eventually power was out. And it shut down.
So I hooked it up again but nothing happened. Pressing the "on" button made it start.. The DVD-drive loaded for a second but... that is it just a black screen :S
Going to bring it back to the shop tomorrow.
Suxors

Lenovo G560 - Issue with won't boot and black screen after HDD upgrade

Lenovo G560 - Issue with won't boot and black screen after HDD upgrade.
What happen: My laptop was working fine, no blue screen issue, no funny business at all. I bought a new SSD Intel 120 GB and thought it would be a good idea to replace the HDD. I shutdown and disconnected the power adapter, waited a couple of minutes and removed the battery. I opened up the back case and replaced the HDD. And put all the screws back and put the battery back in.
Problem: The very first time I turned the power on, nothing happens besides a black screen. I pressed the dvd drive it works and opens up and closes. I waited for about 30 mins and still has blac screen. When I mean black screen, no bios menu, no logo, just a black screen with the fan sound on.
I have tried these:
1. Unplugged everything - battery, adapter, and pressed the power on button for about 60 seconds, nothing, the laptop turns on with the LED display on for both on and battery LED's. But nothing but black screen, no sound of windows loading just the fan and black screen.
2. I tried putting back my old 2.5" and nothing but black screen.
Thoughts and suggestions?
Solved!
Go to Solution.

Hi Autoexit173,
Welcome to Lenovo Community!
As per the query we understood that you are facing issue with system not booting in your Lenovo G560 laptop.
As you have mentioned that the system not booting, please try to remove the RAM and turn on the system and check if you can hear any beep sound. Also try to clean the RAM slots and check for the issue.
Click here for the steps to remove the RAM and refer page number 40.
Hope this helps. Do post back if issue persists!
Best regards,
Ashwin.S
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[Solved]Black screen after "waiting for udev uevents to be processed"

Hello friends,
Starting from late Dec., my laptop goes black screen after "waiting for udev uevents to be processed", after updating kernel to 2.26.32.*. The strange thing is that even the screen is black, the keyboard is working. For example, I can turn on/off the status lights of capslock and others. I guess something might be wrong with udev uevents configuration with regard to the latest kernel. I've noticed that in the new kernel, there are two drivers for intel integrated graphics. My laptop has a 855G, which is supposed to be functional by both drivers, at least according to the kernel description. Maybe because the udev is configured to use the second driver (for newer graphic chips), rather than the first driver, which caused the problem?
Regards,
Wen
Last edited by Wen (2010-01-28 13:14:28)

Have a look here: http://bbs.archlinux.org/viewtopic.php? … 70#p695670

Black screen after login while on battery with graphics switching enabled

Getting a black screen after entering my password while logging into my account while on battery with graphics switching enabled. Everything is up and running, I just can't see it.
I can log into the guest account on battery
I can log into my account while plugged into power
I can log into my account on battery if graphics switching is disabled
I believe something that is starting up in my account is causing the system to switch from integrated to discrete graphics on login, and that switch isn't working correctly on battery power.
As a work around for now, I can run with graphics switching disabled, but I'd like to solve this so I get longer battery life.
MacBook Pro Retina 15"
Mountain Lion
All updates applied

I had the same issue and managed to reslove it.
Shut down your machine.
Power it back on while holding the 'shift' key (left or right, doesn't matter)
You will see a greay progress bar go across the screen while you boot in to 'safe boot'
Once booted, login, and go to Energy Saver and turn on 'Automatic Graphics Switching'.
Reboot back in to normal mode, and you should be able to log back in and see again.
I did this without being plugged into AC power.
Hope it helps!
Cheers!

Xorg black screen after monitor power off, AMD r9 270X & aoc u2868pqu

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