Created attachment 501432 [details] dmesg output, default boot options Description of problem: Black screen during/after boot, unresponsive to the user -as if the display was turned off- yet the system continues loading. The System: HP Pavilion g6, intel core i3, fresh Fedora Core 15 install, with the latest software updates(may 27 2011). Note: the same black screen appears during installation with the livecd, I had to add nomodeset to boot it properly, removed it later to use the intel driver instead of vesa. After searching for a solution it seems to me that the problem could be related to ACPI and the screen brightness, found some workarounds. 1. boot the system with the default options, black screen appears, brightness controls are unresponsive, if you close the lid and reopen it, screen becomes visible and brightness controls function properly. 2. boot with video.brightness_switch_enabled=1 and while the black screen still appears, the brightness controls function properly and you can use them to make the screen visible. I didn't find a way to make the screen visible without user intervention. Version-Release number of selected component (if applicable): Fedora Core 15 - 2.6.38.6-27.fc15.x86_64 HP Pavilion g6, intel Core i3 How reproducible: Always, boot with default options, unresponsive black screen. Steps to Reproduce: 1.Boot system with default options 2. 3. Actual results: Unresponsive black screen Expected results: Visible screen Additional info: http://forums.fedoraforum.org/showthread.php?t=254166 (the same problem)
Created attachment 501433 [details] Xorg log, default boot options
Created attachment 501434 [details] lspci output
I can reproduce the same problem here on my laptop after installing F15. Details: - Acer Aspire 5732Z - Intel Integrated Graphics Chipset When booting into the older F14 kernels, which are still installed, error is not reproducible. Only when booting into F15 kernel. My workaround: I used a flashlight to make parts of my screen visible and login into my session, open a terminal and adjust the screen brightness via a terminal. `sudo setpci -s 00:02.0 F4.B=90` WARNING: Makes you feel quite stupid.
Created attachment 501515 [details] Xorg log - Acer Aspire 5732Z
Created attachment 501517 [details] lspci output - Acer Aspire 5732Z
Any news on this one?
I can confirm this issue still exists. Using kernel 3.2.10, xf86-video-intel 2.18.0-1. The only workaround at the moment seems to be using setpci, as Kenny originally mentioned. The values also seem to be reversed (00 is full brightness, FF is off..?) Even this solution is only a temporary fix -- certain things (e.g. acpi/screen timeout, xbacklight) will all either fail, or switch off the display again, resulting in needing to run the setpci workaround again.
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