Hi, Jaak, On Wed, Nov 1, 2023 at 7:52 PM Jaak Ristioja <jaak@xxxxxxxxxxx> wrote: > > On 31.10.23 14:17, Huacai Chen wrote: > > Hi, Jaak and Evan, > > > > On Sun, Oct 29, 2023 at 9:42 AM Huacai Chen <chenhuacai@xxxxxxxxxx> wrote: > >> > >> On Sat, Oct 28, 2023 at 7:06 PM Jaak Ristioja <jaak@xxxxxxxxxxx> wrote: > >>> > >>> On 26.10.23 03:58, Huacai Chen wrote: > >>>> Hi, Jaak, > >>>> > >>>> On Thu, Oct 26, 2023 at 2:49 AM Jaak Ristioja <jaak@xxxxxxxxxxx> wrote: > >>>>> > >>>>> On 25.10.23 16:23, Huacai Chen wrote: > >>>>>> On Wed, Oct 25, 2023 at 6:08 PM Thorsten Leemhuis > >>>>>> <regressions@xxxxxxxxxxxxx> wrote: > >>>>>>> > >>>>>>> Javier, Dave, Sima, > >>>>>>> > >>>>>>> On 23.10.23 00:54, Evan Preston wrote: > >>>>>>>> On 2023-10-20 Fri 05:48pm, Huacai Chen wrote: > >>>>>>>>> On Fri, Oct 20, 2023 at 5:35 PM Linux regression tracking (Thorsten > >>>>>>>>> Leemhuis) <regressions@xxxxxxxxxxxxx> wrote: > >>>>>>>>>> On 09.10.23 10:54, Huacai Chen wrote: > >>>>>>>>>>> On Mon, Oct 9, 2023 at 4:45 PM Bagas Sanjaya <bagasdotme@xxxxxxxxx> wrote: > >>>>>>>>>>>> On Mon, Oct 09, 2023 at 09:27:02AM +0800, Huacai Chen wrote: > >>>>>>>>>>>>> On Tue, Sep 26, 2023 at 10:31 PM Huacai Chen <chenhuacai@xxxxxxxxxx> wrote: > >>>>>>>>>>>>>> On Tue, Sep 26, 2023 at 7:15 PM Linux regression tracking (Thorsten > >>>>>>>>>>>>>> Leemhuis) <regressions@xxxxxxxxxxxxx> wrote: > >>>>>>>>>>>>>>> On 13.09.23 14:02, Jaak Ristioja wrote: > >>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>> Upgrading to Linux 6.5 on a Lenovo ThinkPad L570 (Integrated Intel HD > >>>>>>>>>>>>>>>> Graphics 620 (rev 02), Intel(R) Core(TM) i7-7500U) results in a blank > >>>>>>>>>>>>>>>> screen after boot until the display manager starts... if it does start > >>>>>>>>>>>>>>>> at all. Using the nomodeset kernel parameter seems to be a workaround. > >>>>>>>>>>>>>>>> > >>>>>>>>>>>>>>>> I've bisected this to commit 60aebc9559492cea6a9625f514a8041717e3a2e4 > >>>>>>>>>>>>>>>> ("drivers/firmware: Move sysfb_init() from device_initcall to > >>>>>>>>>>>>>>>> subsys_initcall_sync"). > >>>>>>>>>>>>>>> > >>>>>>>>>>>>> As confirmed by Jaak, disabling DRM_SIMPLEDRM makes things work fine > >>>>>>>>>>>>> again. So I guess the reason: > >>>>>>>>>> > >>>>>>>>>> Well, this to me still looks a lot (please correct me if I'm wrong) like > >>>>>>>>>> regression that should be fixed, as DRM_SIMPLEDRM was enabled beforehand > >>>>>>>>>> if I understood things correctly. Or is there a proper fix for this > >>>>>>>>>> already in the works and I just missed this? Or is there some good > >>>>>>>>>> reason why this won't/can't be fixed? > >>>>>>>>> > >>>>>>>>> DRM_SIMPLEDRM was enabled but it didn't work at all because there was > >>>>>>>>> no corresponding platform device. Now DRM_SIMPLEDRM works but it has a > >>>>>>>>> blank screen. Of course it is valuable to investigate further about > >>>>>>>>> DRM_SIMPLEDRM on Jaak's machine, but that needs Jaak's effort because > >>>>>>>>> I don't have a same machine. > >>>>>>> > >>>>>>> Side note: Huacai, have you tried working with Jaak to get down to the > >>>>>>> real problem? Evan, might you be able to help out here? > >>>>>> No, Jaak has no response after he 'fixed' his problem by disabling SIMPLEDRM. > >>>>>> > >>>>> > >>>>> I'm sorry, what was it exactly you want me to do? Please be mindful that > >>>>> I'm not familiar with the internals of the Linux kernel and DRI, and it > >>>>> might sometimes take weeks before I have time to work and respond on this. > >>>> It doesn't matter. I hope you can do some experiments to investigate > >>>> deeper. The first experiment you can do is enabling SIMPLEFB (i.e. > >>>> CONFIG_FB_SIMPLE) instead of SIMPLEDRM (CONFIG_DRM_SIMPLEDRM) to see > >>>> whether there is also a blank screen. If no blank screen, that > >>>> probably means SIMPLEDRM has a bug, if still blank screen, that means > >>>> the firmware may pass wrong screen information. > >>> > >>> Testing with 6.5.9 I get a blank screen with CONFIG_DRM_SIMPLEDRM=y and > >>> get no blank screen with CONFIG_FB_SIMPLE=y and CONFIG_DRM_SIMPLEDRM unset. > >> CONFIG_FB_SIMPLE and CONFIG_DRM_SIMPLEDRM use the same device created > >> by sysfb_init(). Since FB_SIMPLE works fine, I think the real problem > >> is that DRM_SIMPLEDRM has a bug. The next step is to enable > >> CONFIG_DRM_SIMPLEDRM and trace its initialization. In detail, adding > >> some printk() in simpledrm_probe() and its sub-routines to see where > >> the driver fails. The output of these printk() can be seen by the > >> 'dmesg' command after boot. > > I need your help. I tried with my laptop (ThinkPad E490, Intel Core > > i3-8145U, UHD Graphics 620) but I can't reproduce your problem. So > > please patch your 6.5.x kernel with this temporary patch [1], then > > build a "bad kernel" with SIMPLEDRM enabled. And after booting your > > machine with this "bad kernel", please give me the dmesg output. Thank > > you very much. > > > > [1] http://ddns.miaomiaomiao.top:9000/download/kernel/patch-6.5.9 > > I'm unable to download it. Can you please send it by e-mail? I'm sorry, please download from attachment. Huacai > > Jaak > > > > > > > Huacai > > > >> > >> Huacai > >> > >>> > >>> Jaak > >>> > >>>> > >>>> Huacai > >>>> > >>>>> > >>>>> Jaak > >>>>> > >>>>>>> > >>>>>>> But I write this mail for a different reason: > >>>>>>> > >>>>>>>> I am having the same issue on a Lenovo Thinkpad P70 (Intel > >>>>>>>> Corporation HD Graphics 530 (rev 06), Intel(R) Core(TM) i7-6700HQ). > >>>>>>>> Upgrading from Linux 6.4.12 to 6.5 and later results in only a blank > >>>>>>>> screen after boot and a rapidly flashing device-access-status > >>>>>>>> indicator. > >>>>>>> > >>>>>>> This additional report makes me wonder if we should revert the culprit > >>>>>>> (60aebc9559492c ("drivers/firmware: Move sysfb_init() from > >>>>>>> device_initcall to subsys_initcall_sync") [v6.5-rc1]). But I guess that > >>>>>>> might lead to regressions for some users? But the patch description says > >>>>>>> that this is not a common configuration, so can we maybe get away with that? > >>>>>> From my point of view, this is not a regression, 60aebc9559492c > >>>>>> doesn't cause a problem, but exposes a problem. So we need to fix the > >>>>>> real problem (SIMPLEDRM has a blank screen on some conditions). This > >>>>>> needs Jaak or Evan's help. > >>>>>> > >>>>>> Huacai > >>>>>>> > >>>>>>> Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat) > >>>>>>> -- > >>>>>>> Everything you wanna know about Linux kernel regression tracking: > >>>>>>> https://linux-regtracking.leemhuis.info/about/#tldr > >>>>>>> If I did something stupid, please tell me, as explained on that page. > >>>>>>> > >>>>>>>>>>>>> When SIMPLEDRM takes over the framebuffer, the screen is blank (don't > >>>>>>>>>>>>> know why). And before 60aebc9559492cea6a9625f ("drivers/firmware: Move > >>>>>>>>>>>>> sysfb_init() from device_initcall to subsys_initcall_sync") there is > >>>>>>>>>>>>> no platform device created for SIMPLEDRM at early stage, so it seems > >>>>>>>>>>>>> also "no problem". > >>>>>>>>>>>> I don't understand above. You mean that after that commit the platform > >>>>>>>>>>>> device is also none, right? > >>>>>>>>>>> No. The SIMPLEDRM driver needs a platform device to work, and that > >>>>>>>>>>> commit makes the platform device created earlier. So, before that > >>>>>>>>>>> commit, SIMPLEDRM doesn't work, but the screen isn't blank; after that > >>>>>>>>>>> commit, SIMPLEDRM works, but the screen is blank. > >>>>>>>>>>> > >>>>>>>>>>> Huacai > >>>>>>>>>>>> > >>>>>>>>>>>> Confused... > >>>>>>>>>>>> > >>>>>>>>>>>> -- > >>>>>>>>>>>> An old man doll... just what I always wanted! - Clara > >>>>>>>>>>> > >>>>>>>>>>> > >>>>>>>> > >>>>>>>> > >>>>> > >>> >
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