[Kernel-packages] [Bug 1949321] Re: Fix System hangs on black screen when reboot
** Changed in: linux (Ubuntu Hirsute)
Status: In Progress => Won't Fix
** Changed in: linux (Ubuntu Focal)
Status: New => Invalid
** Changed in: linux-oem-5.10 (Ubuntu Focal)
Status: In Progress => Won't Fix
** Changed in: hwe-next
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1949321
Title:
Fix System hangs on black screen when reboot
Status in HWE Next:
Fix Released
Status in linux package in Ubuntu:
Fix Released
Status in linux-oem-5.10 package in Ubuntu:
Invalid
Status in linux-oem-5.14 package in Ubuntu:
Invalid
Status in linux source package in Focal:
Invalid
Status in linux-oem-5.10 source package in Focal:
Won't Fix
Status in linux-oem-5.14 source package in Focal:
Fix Released
Status in linux source package in Hirsute:
Won't Fix
Status in linux-oem-5.10 source package in Hirsute:
Invalid
Status in linux-oem-5.14 source package in Hirsute:
Invalid
Status in linux source package in Impish:
Won't Fix
Status in linux-oem-5.10 source package in Impish:
Invalid
Status in linux-oem-5.14 source package in Impish:
Invalid
Status in linux source package in Jammy:
Fix Released
Status in linux-oem-5.10 source package in Jammy:
Invalid
Status in linux-oem-5.14 source package in Jammy:
Invalid
Bug description:
[Impact]
System hangs on black screen when reboot
[Fix]
Looks like our VBIOS/GOP generally fail to turn the DP dual mode adater
TMDS output buffers back on after a reboot. This leads to a black screen
after reboot if we turned the TMDS output buffers off prior to reboot.
And if i915 decides to do a fastboot the black screen will persist even
after i915 takes over.
Apparently this has been a problem ever since commit b2ccb822d376
("drm/i915:Enable/disable TMDS output buffers in DP++ adaptor as needed") if
one rebooted while the display was turned off. And things became worse with
commit fe0f1e3bfdfe ("drm/i915: Shut down displays gracefully on reboot") since
now we always turn the display off before a reboot.
This was reported on a RKL, but I confirmed the same behaviour on my
SNB as well. So looks pretty universal.
Let's fix this by explicitly turning the TMDS output buffers back on
in the encoder->shutdown() hook. Note that this gets called after irqs
have been disabled, so the i2c communication with the DP dual mode
adapter has to be performed via polling (which the gmbus code is
perfectly happy to do for us).
We also need a bit of care in handling DDI encoders which may or may
not be set up for HDMI output. Specifically ddc_pin will not be
populated for a DP only DDI encoder, in which case we don't want to
call intel_gmbus_get_adapter(). We can handle that by simply doing
the dual mode adapter type check before calling
intel_gmbus_get_adapter().
Ref: https://patchwork.freedesktop.org/series/96433/
[Test]
1. install kernel
2. reboot
3. check the monitor works well.
[Regression Potential]
Medium, patch has sent to patchwork but may have a upgraded version in the
furtue.
To manage notifications about this bug go to:
https://bugs.launchpad.net/hwe-next/+bug/1949321/+subscriptions
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[Kernel-packages] [Bug 1949321] Re: Fix System hangs on black screen when reboot
Ubuntu 21.10 (Impish Indri) has reached end of life, so this bug will
not be fixed for that specific release.
** Changed in: linux (Ubuntu Impish)
Status: In Progress => Won't Fix
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-oem-5.14 in Ubuntu.
https://bugs.launchpad.net/bugs/1949321
Title:
Fix System hangs on black screen when reboot
Status in HWE Next:
New
Status in linux package in Ubuntu:
Fix Released
Status in linux-oem-5.10 package in Ubuntu:
Invalid
Status in linux-oem-5.14 package in Ubuntu:
Invalid
Status in linux source package in Focal:
New
Status in linux-oem-5.10 source package in Focal:
In Progress
Status in linux-oem-5.14 source package in Focal:
Fix Released
Status in linux source package in Hirsute:
In Progress
Status in linux-oem-5.10 source package in Hirsute:
Invalid
Status in linux-oem-5.14 source package in Hirsute:
Invalid
Status in linux source package in Impish:
Won't Fix
Status in linux-oem-5.10 source package in Impish:
Invalid
Status in linux-oem-5.14 source package in Impish:
Invalid
Status in linux source package in Jammy:
Fix Released
Status in linux-oem-5.10 source package in Jammy:
Invalid
Status in linux-oem-5.14 source package in Jammy:
Invalid
Bug description:
[Impact]
System hangs on black screen when reboot
[Fix]
Looks like our VBIOS/GOP generally fail to turn the DP dual mode adater
TMDS output buffers back on after a reboot. This leads to a black screen
after reboot if we turned the TMDS output buffers off prior to reboot.
And if i915 decides to do a fastboot the black screen will persist even
after i915 takes over.
Apparently this has been a problem ever since commit b2ccb822d376
("drm/i915:Enable/disable TMDS output buffers in DP++ adaptor as needed") if
one rebooted while the display was turned off. And things became worse with
commit fe0f1e3bfdfe ("drm/i915: Shut down displays gracefully on reboot") since
now we always turn the display off before a reboot.
This was reported on a RKL, but I confirmed the same behaviour on my
SNB as well. So looks pretty universal.
Let's fix this by explicitly turning the TMDS output buffers back on
in the encoder->shutdown() hook. Note that this gets called after irqs
have been disabled, so the i2c communication with the DP dual mode
adapter has to be performed via polling (which the gmbus code is
perfectly happy to do for us).
We also need a bit of care in handling DDI encoders which may or may
not be set up for HDMI output. Specifically ddc_pin will not be
populated for a DP only DDI encoder, in which case we don't want to
call intel_gmbus_get_adapter(). We can handle that by simply doing
the dual mode adapter type check before calling
intel_gmbus_get_adapter().
Ref: https://patchwork.freedesktop.org/series/96433/
[Test]
1. install kernel
2. reboot
3. check the monitor works well.
[Regression Potential]
Medium, patch has sent to patchwork but may have a upgraded version in the
furtue.
To manage notifications about this bug go to:
https://bugs.launchpad.net/hwe-next/+bug/1949321/+subscriptions
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[Kernel-packages] [Bug 1949321] Re: Fix System hangs on black screen when reboot
This bug was fixed in the package linux - 5.15.0-17.17
---
linux (5.15.0-17.17) jammy; urgency=medium
* jammy/linux: 5.15.0-17.17 -proposed tracker (LP: #1957809)
-- Andrea Righi Thu, 13 Jan 2022 17:11:21
+0100
** Changed in: linux (Ubuntu Jammy)
Status: In Progress => Fix Released
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-oem-5.14 in Ubuntu.
https://bugs.launchpad.net/bugs/1949321
Title:
Fix System hangs on black screen when reboot
Status in HWE Next:
New
Status in linux package in Ubuntu:
Fix Released
Status in linux-oem-5.10 package in Ubuntu:
Invalid
Status in linux-oem-5.14 package in Ubuntu:
Invalid
Status in linux source package in Focal:
New
Status in linux-oem-5.10 source package in Focal:
In Progress
Status in linux-oem-5.14 source package in Focal:
Fix Released
Status in linux source package in Hirsute:
In Progress
Status in linux-oem-5.10 source package in Hirsute:
Invalid
Status in linux-oem-5.14 source package in Hirsute:
Invalid
Status in linux source package in Impish:
In Progress
Status in linux-oem-5.10 source package in Impish:
Invalid
Status in linux-oem-5.14 source package in Impish:
Invalid
Status in linux source package in Jammy:
Fix Released
Status in linux-oem-5.10 source package in Jammy:
Invalid
Status in linux-oem-5.14 source package in Jammy:
Invalid
Bug description:
[Impact]
System hangs on black screen when reboot
[Fix]
Looks like our VBIOS/GOP generally fail to turn the DP dual mode adater
TMDS output buffers back on after a reboot. This leads to a black screen
after reboot if we turned the TMDS output buffers off prior to reboot.
And if i915 decides to do a fastboot the black screen will persist even
after i915 takes over.
Apparently this has been a problem ever since commit b2ccb822d376
("drm/i915:Enable/disable TMDS output buffers in DP++ adaptor as needed") if
one rebooted while the display was turned off. And things became worse with
commit fe0f1e3bfdfe ("drm/i915: Shut down displays gracefully on reboot") since
now we always turn the display off before a reboot.
This was reported on a RKL, but I confirmed the same behaviour on my
SNB as well. So looks pretty universal.
Let's fix this by explicitly turning the TMDS output buffers back on
in the encoder->shutdown() hook. Note that this gets called after irqs
have been disabled, so the i2c communication with the DP dual mode
adapter has to be performed via polling (which the gmbus code is
perfectly happy to do for us).
We also need a bit of care in handling DDI encoders which may or may
not be set up for HDMI output. Specifically ddc_pin will not be
populated for a DP only DDI encoder, in which case we don't want to
call intel_gmbus_get_adapter(). We can handle that by simply doing
the dual mode adapter type check before calling
intel_gmbus_get_adapter().
Ref: https://patchwork.freedesktop.org/series/96433/
[Test]
1. install kernel
2. reboot
3. check the monitor works well.
[Regression Potential]
Medium, patch has sent to patchwork but may have a upgraded version in the
furtue.
To manage notifications about this bug go to:
https://bugs.launchpad.net/hwe-next/+bug/1949321/+subscriptions
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[Kernel-packages] [Bug 1949321] Re: Fix System hangs on black screen when reboot
** Changed in: linux-oem-5.14 (Ubuntu Hirsute)
Status: New => Invalid
** Changed in: linux-oem-5.14 (Ubuntu Impish)
Status: New => Invalid
** Changed in: linux-oem-5.10 (Ubuntu Hirsute)
Status: New => Invalid
** Changed in: linux-oem-5.10 (Ubuntu Impish)
Status: New => Invalid
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-oem-5.14 in Ubuntu.
https://bugs.launchpad.net/bugs/1949321
Title:
Fix System hangs on black screen when reboot
Status in HWE Next:
New
Status in linux package in Ubuntu:
In Progress
Status in linux-oem-5.10 package in Ubuntu:
Invalid
Status in linux-oem-5.14 package in Ubuntu:
Invalid
Status in linux source package in Focal:
New
Status in linux-oem-5.10 source package in Focal:
In Progress
Status in linux-oem-5.14 source package in Focal:
Fix Released
Status in linux source package in Hirsute:
In Progress
Status in linux-oem-5.10 source package in Hirsute:
Invalid
Status in linux-oem-5.14 source package in Hirsute:
Invalid
Status in linux source package in Impish:
In Progress
Status in linux-oem-5.10 source package in Impish:
Invalid
Status in linux-oem-5.14 source package in Impish:
Invalid
Status in linux source package in Jammy:
In Progress
Status in linux-oem-5.10 source package in Jammy:
Invalid
Status in linux-oem-5.14 source package in Jammy:
Invalid
Bug description:
[Impact]
System hangs on black screen when reboot
[Fix]
Looks like our VBIOS/GOP generally fail to turn the DP dual mode adater
TMDS output buffers back on after a reboot. This leads to a black screen
after reboot if we turned the TMDS output buffers off prior to reboot.
And if i915 decides to do a fastboot the black screen will persist even
after i915 takes over.
Apparently this has been a problem ever since commit b2ccb822d376
("drm/i915:Enable/disable TMDS output buffers in DP++ adaptor as needed") if
one rebooted while the display was turned off. And things became worse with
commit fe0f1e3bfdfe ("drm/i915: Shut down displays gracefully on reboot") since
now we always turn the display off before a reboot.
This was reported on a RKL, but I confirmed the same behaviour on my
SNB as well. So looks pretty universal.
Let's fix this by explicitly turning the TMDS output buffers back on
in the encoder->shutdown() hook. Note that this gets called after irqs
have been disabled, so the i2c communication with the DP dual mode
adapter has to be performed via polling (which the gmbus code is
perfectly happy to do for us).
We also need a bit of care in handling DDI encoders which may or may
not be set up for HDMI output. Specifically ddc_pin will not be
populated for a DP only DDI encoder, in which case we don't want to
call intel_gmbus_get_adapter(). We can handle that by simply doing
the dual mode adapter type check before calling
intel_gmbus_get_adapter().
Ref: https://patchwork.freedesktop.org/series/96433/
[Test]
1. install kernel
2. reboot
3. check the monitor works well.
[Regression Potential]
Medium, patch has sent to patchwork but may have a upgraded version in the
furtue.
To manage notifications about this bug go to:
https://bugs.launchpad.net/hwe-next/+bug/1949321/+subscriptions
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[Kernel-packages] [Bug 1949321] Re: Fix System hangs on black screen when reboot
This bug was fixed in the package linux-oem-5.14 - 5.14.0-1007.7
---
linux-oem-5.14 (5.14.0-1007.7) focal; urgency=medium
* focal/linux-oem-5.14: 5.14.0-1007.7 -proposed tracker (LP: #1949349)
* Intel I225-IT ethernet controller: igc: probe of :02:00.0 failed with
error -1 (LP: #1945576)
- igc: Remove _I_PHY_ID checking
- igc: Remove phy->type checking
* Fix Screen freeze after resume from suspend with iGPU [1002:6987]
(LP: #1949050)
- drm/amdgpu: reenable BACO support for 699F:C7 polaris12 SKU
- drm/amdgpu: add missing cleanups for Polaris12 UVD/VCE on suspend
- drm/amdgpu: Fix crash on device remove/driver unload
* Fail to detect audio output from external monitor (LP: #1948767)
- ALSA: hda: intel: Allow repeatedly probing on codec configuration errors
* Fix System hangs on black screen when reboot (LP: #1949321)
- SAUCE: drm/i915: Don't request GMBUS to generate irqs when called while
irqs
are off
- SAUCE: drm/i915/hdmi: Turn DP++ TMDS output buffers back on in
encoder->shutdown()
-- Timo Aaltonen Mon, 01 Nov 2021
12:38:15 +0200
** Changed in: linux-oem-5.14 (Ubuntu Focal)
Status: Fix Committed => Fix Released
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-oem-5.14 in Ubuntu.
https://bugs.launchpad.net/bugs/1949321
Title:
Fix System hangs on black screen when reboot
Status in HWE Next:
New
Status in linux package in Ubuntu:
In Progress
Status in linux-oem-5.10 package in Ubuntu:
Invalid
Status in linux-oem-5.14 package in Ubuntu:
Invalid
Status in linux source package in Focal:
New
Status in linux-oem-5.10 source package in Focal:
In Progress
Status in linux-oem-5.14 source package in Focal:
Fix Released
Status in linux source package in Hirsute:
In Progress
Status in linux-oem-5.10 source package in Hirsute:
New
Status in linux-oem-5.14 source package in Hirsute:
New
Status in linux source package in Impish:
In Progress
Status in linux-oem-5.10 source package in Impish:
New
Status in linux-oem-5.14 source package in Impish:
New
Status in linux source package in Jammy:
In Progress
Status in linux-oem-5.10 source package in Jammy:
Invalid
Status in linux-oem-5.14 source package in Jammy:
Invalid
Bug description:
[Impact]
System hangs on black screen when reboot
[Fix]
Looks like our VBIOS/GOP generally fail to turn the DP dual mode adater
TMDS output buffers back on after a reboot. This leads to a black screen
after reboot if we turned the TMDS output buffers off prior to reboot.
And if i915 decides to do a fastboot the black screen will persist even
after i915 takes over.
Apparently this has been a problem ever since commit b2ccb822d376
("drm/i915:Enable/disable TMDS output buffers in DP++ adaptor as needed") if
one rebooted while the display was turned off. And things became worse with
commit fe0f1e3bfdfe ("drm/i915: Shut down displays gracefully on reboot") since
now we always turn the display off before a reboot.
This was reported on a RKL, but I confirmed the same behaviour on my
SNB as well. So looks pretty universal.
Let's fix this by explicitly turning the TMDS output buffers back on
in the encoder->shutdown() hook. Note that this gets called after irqs
have been disabled, so the i2c communication with the DP dual mode
adapter has to be performed via polling (which the gmbus code is
perfectly happy to do for us).
We also need a bit of care in handling DDI encoders which may or may
not be set up for HDMI output. Specifically ddc_pin will not be
populated for a DP only DDI encoder, in which case we don't want to
call intel_gmbus_get_adapter(). We can handle that by simply doing
the dual mode adapter type check before calling
intel_gmbus_get_adapter().
Ref: https://patchwork.freedesktop.org/series/96433/
[Test]
1. install kernel
2. reboot
3. check the monitor works well.
[Regression Potential]
Medium, patch has sent to patchwork but may have a upgraded version in the
furtue.
To manage notifications about this bug go to:
https://bugs.launchpad.net/hwe-next/+bug/1949321/+subscriptions
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[Kernel-packages] [Bug 1949321] Re: Fix System hangs on black screen when reboot
** Tags added: verification-done-focal
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-oem-5.14 in Ubuntu.
https://bugs.launchpad.net/bugs/1949321
Title:
Fix System hangs on black screen when reboot
Status in HWE Next:
New
Status in linux package in Ubuntu:
In Progress
Status in linux-oem-5.10 package in Ubuntu:
Invalid
Status in linux-oem-5.14 package in Ubuntu:
Invalid
Status in linux source package in Focal:
New
Status in linux-oem-5.10 source package in Focal:
In Progress
Status in linux-oem-5.14 source package in Focal:
Fix Committed
Status in linux source package in Hirsute:
In Progress
Status in linux-oem-5.10 source package in Hirsute:
New
Status in linux-oem-5.14 source package in Hirsute:
New
Status in linux source package in Impish:
In Progress
Status in linux-oem-5.10 source package in Impish:
New
Status in linux-oem-5.14 source package in Impish:
New
Status in linux source package in Jammy:
In Progress
Status in linux-oem-5.10 source package in Jammy:
Invalid
Status in linux-oem-5.14 source package in Jammy:
Invalid
Bug description:
[Impact]
System hangs on black screen when reboot
[Fix]
Looks like our VBIOS/GOP generally fail to turn the DP dual mode adater
TMDS output buffers back on after a reboot. This leads to a black screen
after reboot if we turned the TMDS output buffers off prior to reboot.
And if i915 decides to do a fastboot the black screen will persist even
after i915 takes over.
Apparently this has been a problem ever since commit b2ccb822d376
("drm/i915:Enable/disable TMDS output buffers in DP++ adaptor as needed") if
one rebooted while the display was turned off. And things became worse with
commit fe0f1e3bfdfe ("drm/i915: Shut down displays gracefully on reboot") since
now we always turn the display off before a reboot.
This was reported on a RKL, but I confirmed the same behaviour on my
SNB as well. So looks pretty universal.
Let's fix this by explicitly turning the TMDS output buffers back on
in the encoder->shutdown() hook. Note that this gets called after irqs
have been disabled, so the i2c communication with the DP dual mode
adapter has to be performed via polling (which the gmbus code is
perfectly happy to do for us).
We also need a bit of care in handling DDI encoders which may or may
not be set up for HDMI output. Specifically ddc_pin will not be
populated for a DP only DDI encoder, in which case we don't want to
call intel_gmbus_get_adapter(). We can handle that by simply doing
the dual mode adapter type check before calling
intel_gmbus_get_adapter().
Ref: https://patchwork.freedesktop.org/series/96433/
[Test]
1. install kernel
2. reboot
3. check the monitor works well.
[Regression Potential]
Medium, patch has sent to patchwork but may have a upgraded version in the
furtue.
To manage notifications about this bug go to:
https://bugs.launchpad.net/hwe-next/+bug/1949321/+subscriptions
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[Kernel-packages] [Bug 1949321] Re: Fix System hangs on black screen when reboot
** Changed in: linux-oem-5.14 (Ubuntu Focal)
Status: In Progress => Fix Committed
** Changed in: linux-oem-5.14 (Ubuntu Jammy)
Status: New => Invalid
** Changed in: linux-oem-5.10 (Ubuntu Jammy)
Status: New => Invalid
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-oem-5.14 in Ubuntu.
https://bugs.launchpad.net/bugs/1949321
Title:
Fix System hangs on black screen when reboot
Status in HWE Next:
New
Status in linux package in Ubuntu:
In Progress
Status in linux-oem-5.10 package in Ubuntu:
Invalid
Status in linux-oem-5.14 package in Ubuntu:
Invalid
Status in linux source package in Focal:
New
Status in linux-oem-5.10 source package in Focal:
In Progress
Status in linux-oem-5.14 source package in Focal:
Fix Committed
Status in linux source package in Hirsute:
In Progress
Status in linux-oem-5.10 source package in Hirsute:
New
Status in linux-oem-5.14 source package in Hirsute:
New
Status in linux source package in Impish:
In Progress
Status in linux-oem-5.10 source package in Impish:
New
Status in linux-oem-5.14 source package in Impish:
New
Status in linux source package in Jammy:
In Progress
Status in linux-oem-5.10 source package in Jammy:
Invalid
Status in linux-oem-5.14 source package in Jammy:
Invalid
Bug description:
[Impact]
System hangs on black screen when reboot
[Fix]
Looks like our VBIOS/GOP generally fail to turn the DP dual mode adater
TMDS output buffers back on after a reboot. This leads to a black screen
after reboot if we turned the TMDS output buffers off prior to reboot.
And if i915 decides to do a fastboot the black screen will persist even
after i915 takes over.
Apparently this has been a problem ever since commit b2ccb822d376
("drm/i915:Enable/disable TMDS output buffers in DP++ adaptor as needed") if
one rebooted while the display was turned off. And things became worse with
commit fe0f1e3bfdfe ("drm/i915: Shut down displays gracefully on reboot") since
now we always turn the display off before a reboot.
This was reported on a RKL, but I confirmed the same behaviour on my
SNB as well. So looks pretty universal.
Let's fix this by explicitly turning the TMDS output buffers back on
in the encoder->shutdown() hook. Note that this gets called after irqs
have been disabled, so the i2c communication with the DP dual mode
adapter has to be performed via polling (which the gmbus code is
perfectly happy to do for us).
We also need a bit of care in handling DDI encoders which may or may
not be set up for HDMI output. Specifically ddc_pin will not be
populated for a DP only DDI encoder, in which case we don't want to
call intel_gmbus_get_adapter(). We can handle that by simply doing
the dual mode adapter type check before calling
intel_gmbus_get_adapter().
Ref: https://patchwork.freedesktop.org/series/96433/
[Test]
1. install kernel
2. reboot
3. check the monitor works well.
[Regression Potential]
Medium, patch has sent to patchwork but may have a upgraded version in the
furtue.
To manage notifications about this bug go to:
https://bugs.launchpad.net/hwe-next/+bug/1949321/+subscriptions
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[Kernel-packages] [Bug 1949321] Re: Fix System hangs on black screen when reboot
** Tags added: oem-priority originate-from-1946057 somerville
** Tags added: originate-from-1942069
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-oem-5.14 in Ubuntu.
https://bugs.launchpad.net/bugs/1949321
Title:
Fix System hangs on black screen when reboot
Status in HWE Next:
New
Status in linux package in Ubuntu:
In Progress
Status in linux-oem-5.10 package in Ubuntu:
New
Status in linux-oem-5.14 package in Ubuntu:
New
Status in linux source package in Focal:
New
Status in linux-oem-5.10 source package in Focal:
In Progress
Status in linux-oem-5.14 source package in Focal:
In Progress
Status in linux source package in Hirsute:
In Progress
Status in linux-oem-5.10 source package in Hirsute:
New
Status in linux-oem-5.14 source package in Hirsute:
New
Status in linux source package in Impish:
In Progress
Status in linux-oem-5.10 source package in Impish:
New
Status in linux-oem-5.14 source package in Impish:
New
Status in linux source package in Jammy:
In Progress
Status in linux-oem-5.10 source package in Jammy:
New
Status in linux-oem-5.14 source package in Jammy:
New
Bug description:
[Impact]
System hangs on black screen when reboot
[Fix]
Looks like our VBIOS/GOP generally fail to turn the DP dual mode adater
TMDS output buffers back on after a reboot. This leads to a black screen
after reboot if we turned the TMDS output buffers off prior to reboot.
And if i915 decides to do a fastboot the black screen will persist even
after i915 takes over.
Apparently this has been a problem ever since commit b2ccb822d376
("drm/i915:Enable/disable TMDS output buffers in DP++ adaptor as needed") if
one rebooted while the display was turned off. And things became worse with
commit fe0f1e3bfdfe ("drm/i915: Shut down displays gracefully on reboot") since
now we always turn the display off before a reboot.
This was reported on a RKL, but I confirmed the same behaviour on my
SNB as well. So looks pretty universal.
Let's fix this by explicitly turning the TMDS output buffers back on
in the encoder->shutdown() hook. Note that this gets called after irqs
have been disabled, so the i2c communication with the DP dual mode
adapter has to be performed via polling (which the gmbus code is
perfectly happy to do for us).
We also need a bit of care in handling DDI encoders which may or may
not be set up for HDMI output. Specifically ddc_pin will not be
populated for a DP only DDI encoder, in which case we don't want to
call intel_gmbus_get_adapter(). We can handle that by simply doing
the dual mode adapter type check before calling
intel_gmbus_get_adapter().
Ref: https://patchwork.freedesktop.org/series/96433/
[Test]
1. install kernel
2. reboot
3. check the monitor works well.
[Regression Potential]
Medium, patch has sent to patchwork but may have a upgraded version in the
furtue.
To manage notifications about this bug go to:
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[Kernel-packages] [Bug 1949321] Re: Fix System hangs on black screen when reboot
** Description changed:
[Impact]
-
+ System hangs on black screen when reboot
[Fix]
-
+ Looks like our VBIOS/GOP generally fail to turn the DP dual mode adater
+ TMDS output buffers back on after a reboot. This leads to a black screen
+ after reboot if we turned the TMDS output buffers off prior to reboot.
+ And if i915 decides to do a fastboot the black screen will persist even
+ after i915 takes over.
+
+ Apparently this has been a problem ever since commit b2ccb822d376
("drm/i915:Enable/disable TMDS output buffers in DP++ adaptor as needed") if
one rebooted while the display was turned off. And things became worse with
commit fe0f1e3bfdfe ("drm/i915: Shut down displays gracefully on reboot") since
now we always turn the display off before a reboot.
+
+ This was reported on a RKL, but I confirmed the same behaviour on my
+ SNB as well. So looks pretty universal.
+
+ Let's fix this by explicitly turning the TMDS output buffers back on
+ in the encoder->shutdown() hook. Note that this gets called after irqs
+ have been disabled, so the i2c communication with the DP dual mode
+ adapter has to be performed via polling (which the gmbus code is
+ perfectly happy to do for us).
+
+ We also need a bit of care in handling DDI encoders which may or may
+ not be set up for HDMI output. Specifically ddc_pin will not be
+ populated for a DP only DDI encoder, in which case we don't want to
+ call intel_gmbus_get_adapter(). We can handle that by simply doing
+ the dual mode adapter type check before calling
+ intel_gmbus_get_adapter().
+ Ref: https://patchwork.freedesktop.org/series/96433/
[Test]
-
+ 1. install kernel
+ 2. reboot
+ 3. check the monitor works well.
[Regression Potential]
+ Medium, patch has sent to patchwork but may have a upgraded version in the
furtue.
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https://bugs.launchpad.net/bugs/1949321
Title:
Fix System hangs on black screen when reboot
Status in linux package in Ubuntu:
In Progress
Status in linux-oem-5.10 package in Ubuntu:
New
Status in linux-oem-5.14 package in Ubuntu:
New
Status in linux source package in Focal:
New
Status in linux-oem-5.10 source package in Focal:
In Progress
Status in linux-oem-5.14 source package in Focal:
In Progress
Status in linux source package in Hirsute:
In Progress
Status in linux-oem-5.10 source package in Hirsute:
New
Status in linux-oem-5.14 source package in Hirsute:
New
Status in linux source package in Impish:
In Progress
Status in linux-oem-5.10 source package in Impish:
New
Status in linux-oem-5.14 source package in Impish:
New
Status in linux source package in Jammy:
In Progress
Status in linux-oem-5.10 source package in Jammy:
New
Status in linux-oem-5.14 source package in Jammy:
New
Bug description:
[Impact]
System hangs on black screen when reboot
[Fix]
Looks like our VBIOS/GOP generally fail to turn the DP dual mode adater
TMDS output buffers back on after a reboot. This leads to a black screen
after reboot if we turned the TMDS output buffers off prior to reboot.
And if i915 decides to do a fastboot the black screen will persist even
after i915 takes over.
Apparently this has been a problem ever since commit b2ccb822d376
("drm/i915:Enable/disable TMDS output buffers in DP++ adaptor as needed") if
one rebooted while the display was turned off. And things became worse with
commit fe0f1e3bfdfe ("drm/i915: Shut down displays gracefully on reboot") since
now we always turn the display off before a reboot.
This was reported on a RKL, but I confirmed the same behaviour on my
SNB as well. So looks pretty universal.
Let's fix this by explicitly turning the TMDS output buffers back on
in the encoder->shutdown() hook. Note that this gets called after irqs
have been disabled, so the i2c communication with the DP dual mode
adapter has to be performed via polling (which the gmbus code is
perfectly happy to do for us).
We also need a bit of care in handling DDI encoders which may or may
not be set up for HDMI output. Specifically ddc_pin will not be
populated for a DP only DDI encoder, in which case we don't want to
call intel_gmbus_get_adapter(). We can handle that by simply doing
the dual mode adapter type check before calling
intel_gmbus_get_adapter().
Ref: https://patchwork.freedesktop.org/series/96433/
[Test]
1. install kernel
2. reboot
3. check the monitor works well.
[Regression Potential]
Medium, patch has sent to patchwork but may have a upgraded version in the
furtue.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1949321/+subscriptions
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