[Bug 103370] `vblank_mode=0 DRI_PRIME=1 glxgears` will introduce GPU lock up on Intel Graphics [8086:5917] + AMD Graphics [1002:6665] (rev c3)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103370

--- Comment #40 from Shih-Yuan Lee <fourdollars at gmail.com> ---
Created attachment 135662
  --> https://bugs.freedesktop.org/attachment.cgi?id=135662&action=edit
dmesg

(In reply to Alex Deucher from comment #38)
> Created attachment 135647 [details] [review]
> workaround for radeon
> 
> workarounds for radeon and amdgpu to fix the issue.

I applied this patch on top of Ubuntu-4.4.0-101.124 Linux kernel and it seems
to fix the issue in the beginning.
But it has some problem later on.

$ seq 20 | while read i; do echo Loop $i; DRI_PRIME=1 glxgears -info|head -n 5;
done                                                                            
Loop 1
radeon: Failed to allocate virtual address for buffer:
radeon:    size      : 65536 bytes
radeon:    alignment : 4096 bytes
radeon:    domains   : 4
radeon:    va        : 0x0000000000800000
radeon: Failed to deallocate virtual address for buffer:
radeon:    size      : 65536 bytes
radeon:    va        : 0x800000
radeon: Failed to allocate virtual address for buffer:
radeon:    size      : 65536 bytes
radeon:    alignment : 4096 bytes
radeon:    domains   : 4
radeon:    va        : 0x0000000000800000
radeon: Failed to deallocate virtual address for buffer:
radeon:    size      : 65536 bytes
radeon:    va        : 0x800000
radeonsi: Failed to create a context.
Loop 2
...

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