Bug#940633: linux-image-5.2.0-2-amd64: UI microfreezes with with i915 driver

[Gregor Riepl <onitake@gmail.com>]

Package: src:linux
Version: 5.2.9-2
Severity: important
Tags: patch upstream

Dear Maintainer,

Linux 5.2 kernels contain a bug that causes short graphics freezes when using
the i915 driver on certain Intel GPUs.

The issue was originally reported here:
https://bugzilla.kernel.org/show_bug.cgi?id=204183

A patch for 5.2 is available here:
https://patchwork.freedesktop.org/series/63774/#rev4

This patch will likely be included in kernel 5.3, but 5.2 and possibly older
kernels are also affected.

Please consider adding this patch to 5.2 until it arrives in a stable kernel.

As a temporary workaround, it's possible to disable PSR (Panel Self Refresh) by
adding i915.enable_psr=0 to the kernel command line. There may be higher power
consumption or other consequences.

Thanks!

(Package-specific info truncated because it's not relevant to the problem)


-- Package-specific info:
** Version:
Linux version 5.2.0-2-amd64 (debian-kernel@lists.debian.org) (gcc version 8.3.0
(Debian 8.3.0-21)) #1 SMP Debian 5.2.9-2 (2019-08-21)

** Command line:
N/A

** Kernel log:
N/A

** Model information
N/A

** Loaded modules:
i915

** PCI devices:
00:02.0 VGA compatible controller [0300]: Intel Corporation HD Graphics 620
[8086:5916] (rev 02) (prog-if 00 [VGA controller])

** USB devices:
N/A



-- System Information:
Debian Release: bullseye/sid
  APT prefers testing
  APT policy: (900, 'testing'), (300, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.2.0-2-amd64 (SMP w/4 CPU cores)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8),
LANGUAGE=en_GB:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages linux-image-5.2.0-2-amd64 depends on:
ii  initramfs-tools [linux-initramfs-tool]  0.135
ii  kmod                                    26-2
ii  linux-base                              4.6

Versions of packages linux-image-5.2.0-2-amd64 recommends:
ii  apparmor             2.13.3-5
ii  firmware-linux-free  3.4

Versions of packages linux-image-5.2.0-2-amd64 suggests:
pn  debian-kernel-handbook  <none>
ii  grub-efi-amd64          2.04-3
pn  linux-doc-5.2           <none>

Versions of packages linux-image-5.2.0-2-amd64 is related to:
ii  firmware-amd-graphics     20190717-2
pn  firmware-atheros          <none>
pn  firmware-bnx2             <none>
pn  firmware-bnx2x            <none>
pn  firmware-brcm80211        <none>
pn  firmware-cavium           <none>
pn  firmware-intel-sound      <none>
pn  firmware-intelwimax       <none>
pn  firmware-ipw2x00          <none>
pn  firmware-ivtv             <none>
ii  firmware-iwlwifi          20190717-2
pn  firmware-libertas         <none>
ii  firmware-linux-nonfree    20190717-2
ii  firmware-misc-nonfree     20190717-2
pn  firmware-myricom          <none>
pn  firmware-netxen           <none>
pn  firmware-qlogic           <none>
pn  firmware-realtek          <none>
pn  firmware-samsung          <none>
pn  firmware-siano            <none>
pn  firmware-ti-connectivity  <none>
pn  xen-hypervisor            <none>