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commit2cfce3a86bupstream. Commit184add2ca2("libata: Apply NOLPM quirk for SanDisk SD7UB3Q*G1001 SSDs") disabled LPM for SanDisk SD7UB3Q*G1001 SSDs. This has lead to several reports of users of that SSD where LPM was working fine and who know have a significantly increased idle power consumption on their laptops. Likely there is another problem on the T450s from the original reporter which gets exposed by the uncore reaching deeper sleep states (higher PC-states) due to LPM being enabled. The problem as reported, a hardfreeze about once a day, already did not sound like it would be caused by LPM and the reports of the SSD working fine confirm this. The original reporter is ok with dropping the quirk. A X250 user has reported the same hard freeze problem and for him the problem went away after unrelated updates, I suspect some GPU driver stack changes fixed things. TL;DR: The original reporters problem were triggered by LPM but not an LPM issue, so drop the quirk for the SSD in question. BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1583207 Cc: stable@vger.kernel.org Cc: Richard W.M. Jones <rjones@redhat.com> Cc: Lorenzo Dalrio <lorenzo.dalrio@gmail.com> Reported-by: Lorenzo Dalrio <lorenzo.dalrio@gmail.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: "Richard W.M. Jones" <rjones@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.