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michaeltherobot 05-07-2005 08:20 AM

Screen dim/negative after reboot from winXP
I dual boot Windows XP and Linux. When booting into Linux after being in Windows, the screen on my laptop has display problems.

Specifically, back when I used to run Mandrake 9.0, the screen would be uniformly dim, maybe 30% of normal, in text mode and graphics mode.

Now that I run SuSE 9.2, the screen is dim in text mode (gray text instead of white), and the green "done" words during boot are dim *purple*. In graphics mode, the screen is dim, but much worse, all colors seem to be negative and images are pixellated; for instance, the spinning waitcursor clock at X startup is a mishmash of green, orange, and purple and of seemingly lower resolution - like the pixels aren't quite lining up as they should. Needless to say, text in graphic mode is almost impossible to read - it's a mix of yellow and purple and again the pixels seem off somehow so I can barely read the text.

*Importantly*, the regular mouse cursor is not affected - it is a smooth black with a bright white 1 pixel outline, which the rest of the screen is unable to achieve.

This horrid condition will remain through several reboots in Linux, but somehow it eventually goes away after a reboot (after years running Mandrake I never did figure it out; I just squinted at the dim screen.) If I reboot into Windows XP, though, I will have the problem again next time I reboot into Linux.

In case this is important, SuSE installations are unable to determine my screen geometry, and I am prompted to enter it in mm. Usually I ignore this rather than guessing, and it seems to not matter! Mandrake didn't have that problem.

As a footnote, I ran SuSE 9.2 for a while without Windows XP on this box, and did not have these display problems. I then formatted, installed Windows XP, started installing SuSE 9.2, and found the display problems during install.

HP Pavilion laptop, branded N5000 which is a codeword for "custom box that has hardware almost exactly like an XH575".

Video card: Trident Video Accelerator CyberBlade-XP (HP) [this is the name of the driver according to Windows; it's a vanilla, non-3d-accelerated card that came with the laptop]

Screen: no idea; how do I find out? Windows calls it "default monitor" which doesn't help much.

Thanks in advance for any help!

mcgrew 05-10-2005 05:36 AM

My first question is is whether your acpi is working correctly on this machine?

Some of the HP Pavilions with the phoenix bios don't work correctly with acpi.

Check your /proc files to make sure the acpi stuff is reading correctly. If you suspect something is not, you may try appending acpi=off to the kernel args(apm should take over). There is also a kernel module called omnibook which supports a lot of the acpi for machines with the phoenix bios (My Toshiba M35X for instance), and enables certain features.

If yours doensn't have pheonix, acpi=off may still sounds like it could be a problem with the backlight in linux, This tends to stay at the setting it was on in windows after a reboot (or power off) on my machine.

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