After upgrade kernel v4.6+ I can't use my external monitor any more. it will cause screen flickering every time when I try to connect it. Not only the monitor, but also the projector, I think it should be same way. My laptop is Lenovo T450s OS: Fedora 25 Kernel: 4.10.10-200.fc25.x86_64 00:02.0 VGA compatible controller: Intel Corporation HD Graphics 5500 (rev 09) (prog-if 00 [VGA controller]) Subsystem: Lenovo Device 5036 Flags: bus master, fast devsel, latency 0, IRQ 46 Memory at e0000000 (64-bit, non-prefetchable) [size=16M] Memory at c0000000 (64-bit, prefetchable) [size=512M] I/O ports at 3000 [size=64] [virtual] Expansion ROM at 000c0000 [disabled] [size=128K] Capabilities: <access denied> Kernel driver in use: i915 Kernel modules: i915 I tried to add kernel parameters, but not work (i915.enable_psr=0 (or 1 or 2))
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 5500 (rev 09) (prog-if 00 [VGA controller]) Subsystem: Lenovo Device 5036 Flags: bus master, fast devsel, latency 0, IRQ 46 Memory at e0000000 (64-bit, non-prefetchable) [size=16M] Memory at c0000000 (64-bit, prefetchable) [size=512M] I/O ports at 3000 [size=64] [virtual] Expansion ROM at 000c0000 [disabled] [size=128K] Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit- Capabilities: [d0] Power Management version 2 Capabilities: [a4] PCI Advanced Features Kernel driver in use: i915 Kernel modules: i915
Hello, could you please boot with the parameter "drm.debug=0xe" on grub and provide the full dmesg log? Thank you.
(In reply to Elizabeth from comment #2) > Hello, could you please boot with the parameter "drm.debug=0xe" on grub and > provide the full dmesg log? Thank you. And try with the latest stable or mainline: https://www.kernel.org/ Thanks.
Hello Kun Yan, Had you been able to replicate with newer kernels? Could you share more HW information? Monitor/Projector resolutions? How are you connecting them? Projector has latest firmware? Have you tried different cables/ports/dongles/connectors? Thanks.
When I upgraded to Kernel 4.11.x the flickering has gone. few times flickering only happened in login screen.
Thanks for the information Kun Yan, then I'm closing the bug as fixed.
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