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Kernel hangs with DRM enabled
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HJarausch
n00b
n00b


Joined: 23 Feb 2009
Posts: 6

PostPosted: Wed Sep 04, 2013 10:45 am    Post subject: Kernel hangs with DRM enabled Reply with quote

Hi,

I have a strange problem on an HP 625 laptop. I configure my kernels "by hand" for a long time and on several machines.
But this one challenges me.

I'm using the gentoo-sources 3.10.9.

1st) if I use the .config file from SystemRescueCD, the kernel boots and I can even start X with the Radeon driver.

2nd) But if I use my own kernel configuration with all DRM related configure options identical to that of SystemRescueCD
my kernel freezes with a blank screen just after "Waiting for uevents to be processed"

3rd) If disable (only) DRM the kernel boots just fine (but then I cannot start X since the Radeon driver needs DRM)

Has anybody an idea what's going on or how to debug this?

Many thanks for hint,
Helmut
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audiodef
Watchman
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Joined: 06 Jul 2005
Posts: 5256

PostPosted: Wed Sep 04, 2013 1:32 pm    Post subject: Reply with quote

You're using a combination of driver options that's doing this. Probably missing something that DRM needs.

Check out Pappy's Kernel Seeds. Read it over and use a seed for your kernel flavor and version. That should straighten it out. Defconfig is a horrible, horrible thing. :twisted:
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Ant P.
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Joined: 18 Apr 2009
Posts: 2343
Location: UK

PostPosted: Wed Sep 04, 2013 7:26 pm    Post subject: Reply with quote

You're probably missing the firmware. `emerge radeon-ucode` and build the radeon driver as a module.
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audiodef
Watchman
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Joined: 06 Jul 2005
Posts: 5256

PostPosted: Thu Sep 05, 2013 2:23 pm    Post subject: Reply with quote

Add what Ant said to my post, and you'll have a bangin' system. 8)
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