Laptop switches to 40hz refresh rate when i remove AC power

This problem started today,Everytime i remove the ac power;A black screen comes momentarily and the screen which i was working on comes back,but this time the animations are kinda sluggish so i checked the advanced settings for display and found out that every time i remove the ac power it switches to 40Hz refresh rate and when i switch it back to 60Hz and then i plug in,it stays 60 but when i plug out it reverts to 40Hz.What bothers me is that this problem never came until today.

Hey erik,
I really do appreciate your input. That's a good idea, though honestly I don't know if I will bother with all of that now. :-) Perhaps instead if I get a moment in the near future I may try wiping out all Intel graphics drivers entirely from the system manually and then reinstalling.
Having said all of that, on a somewhat unrelated note, I'm getting 4,900+ in 3DMark06, which is shocking! After experiencing the trouble with the unplug/replug refresh rate switch, I tried a wide variety of solutions including using the 2361 graphics drivers from Intel's site. This plus my high-speed fan settings at anything over 60C probably helped contribute to the score I guess.
But back to the topic... is anyone else experiencing these same refresh rate switching issues?
Owner/Technology Specialist
Triple-S Computers - http://www.TripleSComputers.com

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X220 uncontrollably switches to 50Hz refresh rate upon unplug from power source

Hello,
I'd like to reiterate that I LOVE my x220 apart from the few issues I have with it. Having said that, I am having the (seemingly) ubiquitous problem where the laptop constantly switches to 50Hz when unplugged from a power source. I have tried reinstalling the Power Manager and Power Manager driver, and all of my system software is up to date.
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Solved!
Go to Solution.

Hey erik,
I really do appreciate your input. That's a good idea, though honestly I don't know if I will bother with all of that now. :-) Perhaps instead if I get a moment in the near future I may try wiping out all Intel graphics drivers entirely from the system manually and then reinstalling.
Having said all of that, on a somewhat unrelated note, I'm getting 4,900+ in 3DMark06, which is shocking! After experiencing the trouble with the unplug/replug refresh rate switch, I tried a wide variety of solutions including using the 2361 graphics drivers from Intel's site. This plus my high-speed fan settings at anything over 60C probably helped contribute to the score I guess.
But back to the topic... is anyone else experiencing these same refresh rate switching issues?
Owner/Technology Specialist
Triple-S Computers - http://www.TripleSComputers.com

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#    Option "SampleRate"        "150"
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#    Option     "MinX"          "1412"
#    Option     "MaxX"          "15184"
#    Option     "MinY"          "15372"
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#    Driver     "elo2300"
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#    Option     "MinX"          "231"
#    Option     "MaxX"          "3868"
#    Option     "MinY"          "3858"
#    Option     "MaxY"          "272"
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#    Option     "ButtonNumber" "1"
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Section "Monitor"
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# HorizSync may be a comma separated list of discrete values, or a
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# NOTE: THE VALUES HERE ARE EXAMPLES ONLY. REFER TO YOUR MONITOR'S
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#    HorizSync 15-25, 30-50 # multiple ranges of sync frequencies
# VertRefresh is in Hz unless units are specified.
# VertRefresh may be a comma separated list of discrete values, or a
# comma separated list of ranges of values.
# NOTE: THE VALUES HERE ARE EXAMPLES ONLY. REFER TO YOUR MONITOR'S
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    BoardName   "Unknown"
# The chipset line is optional in most cases. It can be used to override
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#    Chipset    "generic"
# The Driver line must be present. When using run-time loadable driver
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#    VideoRam   256
#    Clocks     25.2 28.3
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Section "Device"
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        Modes       "1024x768"
        ViewPort    0 0
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        Modes       "1024x768"
        ViewPort    0 0
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# section may be specified from the X server command line with the
# "-layout" option. In the absence of this, the first section is used.
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Section "ServerLayout"
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# Each Screen line specifies a Screen section name, and optionally
# the relative position of other screens. The four names after
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# right of screen 1.
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# Each InputDevice line specifies an InputDevice section name and
# optionally some options to specify the way the device is to be
# used. Those options include "CorePointer", "CoreKeyboard" and
# "SendCoreEvents".
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Thanks.

I upped the log verbosity on Xorg and checked the Xorg.0.log file. I found some interesting things.
First, I found this line:
(II) I810(0): Will use BIOS call 0x5f05 to set refresh rates for CRTs.
Later on, I found these:
(WW) I810(0): Extended BIOS function 0x5f05 not supported.
(II) I810(0): BIOS call 0x5f05 not supported, setting refresh with VBE 3 method.
(WW) I810(0): Set VBE Mode rejected this modeline.
Trying standard mode instead!
Presumably, "standard mode" is an eye-watering 60Hz.
This is on a Dell Optiplex GX260 with BIOS revision A09. The video chipset is an onboard Intel 82845 and the driver is Xorg's i810.
Everything works fine with Sun's X server. I get a nice 87Hz refresh at 1024x768. I'm surprised that Xorg can't set the refresh on this machine. It's listed as Test Suite Level 2 certified in the HCL. Unless somebody can tell me what I'm doing wrong here, I'm going to post this incompatibility as a comment on the HCL.

Laptop switches to 40hz refresh rate when i remove AC power

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