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Old 03-06-2005, 08:34 PM   #1
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Registered: Mar 2005
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laptop lcd flickering after fedora core 3 install


i've installed fedora core 3 on a compaq evo n800v laptop with the following specs: p4m 1.8ghz, 40gb hd, ati mobility radeon 7500, 512mb ram, 1400x1050 lcd. the installation went fine but i was unable to configure grub for dual booting with xp the first time, so i reinstalled. at the second installation, the lcd screen started flickering at random intervals. kudzu (the hardware detection tool) did not appear, and an error message was displayed at the first boot config screen which indicated trouble with the "display" module.

the system did start correctly, but the flickering continued. i'd chosen "generic lcd panel" (or was it "default lcd monitor" or something? i'm not too sure and too afraid to go back to fedora and check out) in monitor setup, and i set the resolution to 1400x1050, the native resolution of my laptop's lcd panel, and i noticed that the only available refresh rate was 56hz. at the same resolution, windows is running this lcd at 60hz. i quickly rebooted into windows in panic, worried that the lcd might be damaged, and i'm typing this message with a flickering lcd in windows now the flickering has reduced over time, but it remains.

did i just kill my lcd panel? if so, what did i do wrong?

(update: the flickering seems to happen when there is hard disk or keyboard activity .)

(update 2: ok, i've booted back to fedora and here's my "monitor" section in etc/x11/xorg.conf:

Section "Monitor"
Identifier "Monitor0"
VendorName "Monitor Vendor"
ModelName "LCD Panel 1400x1050"
HorizSync 31.5 - 90.0
VertRefresh 59.0 - 75.0
Option "dpms"


- meg

Last edited by meg23; 03-07-2005 at 12:34 AM.
Old 03-06-2005, 10:04 PM   #2
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Registered: Mar 2005
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i have an important update on the problem: the flickering stops when i remove the battery of my laptop. this is getting complicated; it looks like a power problem now. i can't determine whether it happens when running only on batteries because the brightness of the lcd goes minimum when running on battery and fedora won't react to the function+f8 key combination on the laptop to increase brightness, and i can't determine if the lcd flickers when it's this dark. (i'd also appreciate assistance on this problem )

(p.s: i think this should be moved to the laptop section now; i posted it here because i originally thought it was a more general refresh rate / lcd related issue but it seems it's not.)

- meg

Last edited by meg23; 03-07-2005 at 12:34 AM.


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