On Thu, 5 Apr 2018 14:38:24 -0400, Jason Andryuk wrote:
The HP EliteBook G3 850 has a weird bug where a subsequent cold boot hangs while plugged in if Linux enables the Host Notify features of i2c-i801. The cold boot hang depends on how the system boots. It does not hang on UEFI Grub text boot or legacy Grub text boot. But it does hang on legacy Grub graphical boot and Intel Boot Agent PXE text boot. Booting unplugged is not affected.
Disabling the Host Notify feature with disable_feature=0x20 works around the bug, so automatically do so based on DMI information.
More information can be found here: https://www.spinics.net/lists/linux-i2c/msg33938.html
Signed-off-by: Jason Andryuk jandryuk@gmail.com Reviewed-by: Jean Delvare jdelvare@suse.de Cc: stable@vger.kernel.org
v3: Switch to DMI_EXACT_MATCH and add empty element to array
drivers/i2c/busses/i2c-i801.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) (...)
Wolfram and stable, please hold on with this patch, Jason and I may have found a proper fix so blacklisting would no longer be needed.