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author | Tomas Espeleta <tomas.espeleta@gmail.com> | 2019-08-09 16:37:54 +0200 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-10-05 13:13:57 +0200 |
commit | 5397eb1a1fb04e5065491419c6a27cf89ae05120 (patch) | |
tree | 8db5fbe880ba85c3d9b55363412440d470e07485 /Documentation | |
parent | 354098b7045d450fc6d508f20dc155f80bc8871c (diff) | |
download | linux-stable-5397eb1a1fb04e5065491419c6a27cf89ae05120.tar.gz linux-stable-5397eb1a1fb04e5065491419c6a27cf89ae05120.tar.bz2 linux-stable-5397eb1a1fb04e5065491419c6a27cf89ae05120.zip |
ALSA: hda - Add a quirk model for fixing Huawei Matebook X right speaker
[ Upstream commit a2ef03fe617a8365fb7794531b11ba587509a9b9 ]
[ This is rather a revival of the patch Tomas sent in months ago, but
applying only with the quirk model option -- tiwai ]
Hard coded coefficients to make Huawuei Matebook X right speaker
work. The Matebook X has a ALC298, please refer to bug 197801 on
how these numbers were reverse engineered from the Windows driver
The reversed engineered sequence represents a repeating pattern
of verbs, and the only values that are changing periodically are
written on indexes 0x23 and 0x25:
0x500, 0x23
0x400, VALUE1
0x500, 0x25
0x400, VALUE2
* skipped reading sequences (0x500 - 0xc00 sequences are ignored)
* static values from reverse engineering are used
NOTE: since a significant risk is still considered, this is provided
as an experimental fix that isn't applied as default for now. For
enabling the fix, you'll have to choose huawei-mbx-stereo via model
option of snd-hda-intel module.
If we get feedback from users that this works stably, we may apply it
per default.
[ Some coding style fixes and replacement with AC_VERB_* by tiwai ]
BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=197801
Signed-off-by: Tomas Espeleta <tomas.espeleta@gmail.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/sound/hd-audio/models.rst | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/Documentation/sound/hd-audio/models.rst b/Documentation/sound/hd-audio/models.rst index 7d7c191102a7..11298f0ce44d 100644 --- a/Documentation/sound/hd-audio/models.rst +++ b/Documentation/sound/hd-audio/models.rst @@ -260,6 +260,9 @@ alc295-hp-x360 HP Spectre X360 fixups alc-sense-combo Headset button support for Chrome platform +huawei-mbx-stereo + Enable initialization verbs for Huawei MBX stereo speakers; + might be risky, try this at your own risk ALC66x/67x/892 ============== |