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Somez

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  1. Somez

    Lenovo ThinkPad T420 with UEFI Only

    I had it opened in my browser. Still have it. Tried to save it into PDF. Can you check the attachment. t420 guide.pdf
  2. Somez

    Lenovo ThinkPad T420 with UEFI Only

    Hope the others in the forum can help you. I’m unfortunately not good enough to help on this issue
  3. Somez

    Lenovo ThinkPad T420 with UEFI Only

    I would start by booting using verbose mode. how to do this? On the clover boot screen press space on the item you want to boot into and then chikae the verbose option.
  4. Somez

    Lenovo ThinkPad T420 with UEFI Only

    You can now switch back to High Sierra. Latest update has solved the freezing problem we’ve both had.
  5. Somez

    Lenovo ThinkPad T420 with UEFI Only

    I don't want to draw a conclusion too early, but this update fixed all my problems. No more freezes or visual glitches. Even the fan spins a lot more around 2000 RPM.
  6. Somez

    Lenovo ThinkPad T420 with UEFI Only

    Thanks for the tip. I don't have any other usb sticks around except the one used for macOS Installation so I'll stay on High Sierra for a while then. Maybe tluck will figure out something with the Sierra HD3000 kexts...
  7. Somez

    Lenovo ThinkPad T420 with UEFI Only

    How did you do it? My Sierra installer does not allow formatting or even repartitioning my main HD. I guess that's due to the APFS filesystem.
  8. Somez

    Lenovo ThinkPad T420 with UEFI Only

    My machine is 1600x900 by default so I should have the cable already I guess.
  9. Somez

    Lenovo ThinkPad T420 with UEFI Only

    50 eur... I’ll think about it. Can you recommend any reliable sources it’s safe to buy from? I’m not certain about ebay... I agree this machine is easy to fix. I’ve already replaced the heatsink so I have some experience.
  10. Somez

    Lenovo ThinkPad T420 with UEFI Only

    Let’s say I replace the LCD How much is that LG display? Where can I order from? Is it very difficult to replace or it’s screws and some patience? Thanks.
  11. Somez

    Lenovo ThinkPad T420 with UEFI Only

    Just tried command log show --predicate 'processImagePath contains "kernel" ' | egrep -i "pmrd|graphics|brsync" to see if I find anything suspicious from the recent days and found a few interesting items, like these: 2018-03-18 19:12:19.166296+0100 0x2d16 Default 0x0 0 0 kernel: (AppleIntelHD3000Graphics) timestamps = 0x48bbd 2018-03-18 19:12:19.166303+0100 0x2d16 Default 0x0 0 0 kernel: (AppleIntelHD3000Graphics) Semaphore register values: 2018-03-18 19:12:19.166308+0100 0x3bf7 Default 0x0 0 0 kernel: (AppleIntelHD3000Graphics) timestamps = 0x48bbd 2018-03-18 19:12:19.166313+0100 0x2d16 Default 0x0 0 0 kernel: (AppleIntelHD3000Graphics) VRSYNC: (0x12044) = 0x48bbd 2018-03-18 19:12:19.166315+0100 0x3bf7 Default 0x0 0 0 kernel: (AppleIntelHD3000Graphics) Semaphore register values: 2018-03-18 19:12:19.166329+0100 0x2d16 Default 0x0 0 0 kernel: (AppleIntelHD3000Graphics) BRSYNC: (0x22040) = 0x0 2018-03-18 19:12:19.166330+0100 0x3bf7 Default 0x0 0 0 kernel: (AppleIntelHD3000Graphics) VRSYNC: (0x12044) = 0x48bbd 2018-03-18 19:12:19.166355+0100 0x2d16 Default 0x0 0 0 kernel: (AppleIntelHD3000Graphics) RVSYNC: (0x 2040) = 0x0 2018-03-18 19:12:19.166355+0100 0x3bf7 Default 0x0 0 0 kernel: (AppleIntelHD3000Graphics) BRSYNC: (0x22040) = 0x0 2018-03-18 19:12:19.166359+0100 0x3bf7 Default 0x0 0 0 kernel: (AppleIntelHD3000Graphics) RVSYNC: (0x 2040) = 0x0 2018-03-18 19:12:19.166360+0100 0x2d16 Default 0x0 0 0 kernel: (AppleIntelHD3000Graphics) BVSYNC: (0x22044) = 0x0 2018-03-18 19:12:19.166362+0100 0x3bf7 Default 0x0 0 0 kernel: (AppleIntelHD3000Graphics) BVSYNC: (0x22044) = 0x0 2018-03-18 19:12:19.166363+0100 0x2d16 Default 0x0 0 0 kernel: (AppleIntelHD3000Graphics) RBSYNC: (0x 2044) = 0x0 2018-03-18 19:12:19.166365+0100 0x3bf7 Default 0x0 0 0 kernel: (AppleIntelHD3000Graphics) RBSYNC: (0x 2044) = 0x0 2018-03-18 19:12:19.166367+0100 0x2d16 Default 0x0 0 0 kernel: (AppleIntelHD3000Graphics) VBSYNC: (0x12040) = 0x0 2018-03-18 19:12:19.166367+0100 0x3bf7 Default 0x0 0 0 kernel: (AppleIntelHD3000Graphics) VBSYNC: (0x12040) = 0x0 2018-03-18 19:12:24.170357+0100 0x3bf7 Default 0x0 0 0 kernel: (AppleIntelHD3000Graphics) stampWait: Overflowed checking for stamp 0x48be1 on MAIN ring: called from (null) 2018-03-18 19:12:24.170370+0100 0x3bf7 Default 0x0 0 0 kernel: (AppleIntelHD3000Graphics) timestamp = 0x48bbd 2018-03-18 19:12:24.170377+0100 0x3bf7 Default 0x0 0 0 kernel: (AppleIntelHD3000Graphics) **** Debug info for *possible* hang in MAIN graphics engine **** 2018-03-18 19:12:24.170390+0100 0x3bf7 Default 0x0 0 0 kernel: (AppleIntelHD3000Graphics) ring head = 0x38402db4, wrap count = 450 2018-03-18 19:12:24.170398+0100 0x3bf7 Default 0x0 0 0 kernel: (AppleIntelHD3000Graphics) ring tail = 0x00004930 2018-03-18 19:12:24.170409+0100 0x3bf7 Default 0x0 0 0 kernel: (AppleIntelHD3000Graphics) ring control = 0x0000f001 enabled, auto report disabled, not waiting, semaphore not waiting, length = 0x010 4KB pages And now it seems I get these when the system hangs: 2018-03-21 20:05:15.601077+0100 0x47a Default 0x0 0 0 kernel: (IOGraphicsFamily) IOGraphics flags 0x43 (0x51) 2018-03-21 20:05:15.710392+0100 0x47a Default 0x0 0 0 kernel: (AppleIntelHD3000Graphics) Using Dynamic VRAM method 0 2018-03-21 20:05:16.192850+0100 0x537 Default 0x0 0 0 kernel: (AppleGraphicsPowerManagement) [AGPM Controller] build gpuDict by GPU IGPU. 2018-03-21 20:05:16.192980+0100 0x537 Default 0x0 0 0 kernel: (AppleGraphicsPowerManagement) AGPM::start - publish fMinPowerState = 0 fMaxPowerState = 15
  12. Somez

    Lenovo ThinkPad T420 with UEFI Only

    tluck, Earlier you said that using the Sierra HD3000 kexts under High Sierra you've not seen any freezes on your machine with the stock LCD. Is that right or since then you've got freezes with that setup as well?
  13. Somez

    Lenovo ThinkPad T420 with UEFI Only

    Seriously?? It did not work for me, but since then I've reinstalled from scratch so let me try it again.
  14. Somez

    Lenovo ThinkPad T420 with UEFI Only

    Jboeren, my config remained unchanged so it’s definitely high sierra that has some flaw. Don’t worry about the CPU upgrade
  15. Somez

    Lenovo ThinkPad T420 with UEFI Only

    I don't plan on replacing the LCD, so I'm really considering the option to format and install Sierra. Especially that based on the comments almost nobody has reported the freezing issue with High Sierra and we have no clue about what is causing the freezes.
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