Bug 581484 - KMS:RS780M:Mobility Radeon HD 3200 System hangs
KMS:RS780M:Mobility Radeon HD 3200 System hangs
Product: Fedora
Classification: Fedora
Component: kernel (Show other bugs)
All Linux
low Severity medium
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Assigned To: Dave Airlie
Fedora Extras Quality Assurance
Depends On:
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Reported: 2010-04-12 08:00 EDT by Marcus Moeller
Modified: 2010-12-20 01:47 EST (History)
13 users (show)

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Doc Type: Bug Fix
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Last Closed: 2010-12-20 01:47:32 EST
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Description Marcus Moeller 2010-04-12 08:00:59 EDT
Description of problem:

I have installed both F12 and F13 (alpha) on my Lenovo X100e with an ATI RS780M/RS780MN video card.

System hangs during boot, directly after switching to KMS . Removing quiet boot parameter shows up the following error message:

Firmware Bug ACPI brightness control misses _BQC function.

Setting radeon.modeset=0 solves the problem.

Best Regards
Comment 1 Christian Funke 2010-05-22 16:34:54 EDT
I can confirm this bug on my X100e. As a side note the system boots every 10-15th time it try to boot with kms enabled. Using radeon.modeset=0 always boots fine, albeit this leeds to problems woth KDE if I enable desktop effects.
Comment 2 Vedran Miletić 2010-05-24 15:52:18 EDT
Improving summary.


Fedora Bugzappers volunteer triage team

[This triage is part of collective effort done by students of University of
Rijeka Department of Informatics.]
Comment 3 Christian Funke 2010-05-25 03:42:13 EDT
Just as additional information, if I manage to boot with KMS enabled the message "[Firmware Bug] ACPI brightness control misses _BQC function" is also present, so it seems that at random times the system continues, though I have not a found a way to discern when this will happen.

Furtheron I noticed that after a hang the display brightness is set to maximum, independent of its previous setting, so it seems to me that really this brightness detection/setting ist causing this hang
Comment 4 Sebastian Dziallas 2010-12-20 01:47:32 EST
This one seems to work for me now (finally) in F14 with the following kernel version:

[sebastian@bear ~]$ uname -r

Closing. Feel free to reopen if it still affects others. :)

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