ACK: Re: [Disco] Re-enable DRM Support for bochs (qemu stdvga)

[Timo Aaltonen]

On 29.3.2019 16.35, Thomas Lamprecht wrote:
> BugLink: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1795857
> 
> [Impact]
> Booting a Ubuntu with Cosmic kernel inside a QEMU VM with 'stdvga' as display
> hangs on gdm unit, display stays black with a single shell cursor blinking in
> the upper edge. If switching same VM to another display tipe (e.g., qxl) allows
> it to boot just fine.
> 
> [Fix]
> Re-enable the DRM_BOCHS driver to be build as module.
> 
> [Test Case]
> Start an installed Ubuntu 19.04 (e.g., from Beta or weekly built ISOs) inside a
> VM with display 'stdvga'. The installer itself will work, but once you reboot
> you get a broken system. With this patch _and_ the 'blacklist bochs-drm' entry
> from 'kmod' package shipped '/etc/modprobe.d/blacklist-framebuffer.conf' removed
> the system boots as expected, gdm can startup and one can login through a
> graphical session
> 
> [Regression Potential]
> Low. Even the original bug report pondered if it would be better to fix
> bochs-drm instead of plain disabling it. I could not relate to it, but I do not
> have PowerPC hardware to test it. I still mark regression potential low as the
> driver can get simply blacklisted for cases it isn't wanted or makes problems.
> 
> 
> Thomas Lamprecht (1):
>   UBUNTU: [Config] Reenable DRM_BOCHS as module
> 
>  debian.master/config/annotations | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)

Hi, I sent a patch for this last year, and bochs was finally recently
tested to work fine on ppc64el. Doesn't matter which one actually is
applied, but at least your explanation is more verbose, so ACK.



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t