I have a Lenovo Thinkpad T450s with the following core specs:
- Windows 10 Pro x64 1511 [aka Threshold 2] (installed from scratch as 1507 (Threshold 1) and thereafter only updated via Windows Update. System was not upgraded from Win 7/8/or so).
- Intel i7-5600U (2.6Ghz).
- Intel HD Graphics 5500.
- 20GB RAM.
- SanDisk SSD 500GB.
- BIOS 1.25.
- Drivers up-to-date, taken from lenovo.com.
And I got the following problem:
System was running for more than 3/4 of a year very good with Windows 10 Th1 and Th2. Particulaly, there were never any graphic issues on the Desktop, e.g. corrupted graphics or such. However, from time to time (very occasionally, maybe once a month) the display hung for <1sec. and after that Windows reported "Graphics driver has crashed and has been restored". That's why I started to test also drivers from intel.com. But there was no difference.
So, except some very rare display driver crashes (both Lenovo and Intel drivers), everything was alright.
But then I go the 1607 Anniversary Update from Windows Update, and I have installed it.
interestingly, everything still seemd OK for a while (<10 hrs of usage and <10 reboots). But then I started to notice that within some circumstances, the graphics got corrupted and the PC became very(!) slow. There seemed to be a trigger (in my case AIMP 4), and after that the PC was unsuable. the only thing which helped was a reboot.
What exactly happened on the screen? As I've said, Windows become extremely slow (like CPU is busy with 100%, but in fact it was not) and windows (like ALT+F4 shutdown dialogue box) or context boxes (like right click) remained empty (only a 1px frame showed up but with no content).
I have tried different graphics drivers (Lenovo, Intel, Intel beta) but all of them showed this behavior. This occured on both wired and battery operation and was independent on battery saving options (I played around with all of them). I even set BIOS back to defaults but it did not help.
Interestingly, once the PC ran into this corrputed mode, there were only two way to revocer:
- reboot the system, or
- uninstall the Intel drivers.
When the PC was slow and the graphics corrupted, uninstalling the Intel driver helped. So when Windows removed the Intel software and activated its built-in standard VGA driver, the PC was fast again (of course screen resolution was low and the graphic animations not perfectly smooth). After reboot, Windows automatically installed the Intel driver again and again, after the "trigger" (e.g. AIMP) everything started again.
Then there was a comulative update to Win 10 1607, KB3176495 build no. 14393.51. After installing this update, the graphics was already corrupted after reboot. (No trigger required any more). And the graphics issues were even worse. In the start menu, all colors fainted (got darker), the text became black, and other things. After KB3176495, the PC did not get so extremly slow any more, but it still got noticeably slower whatsoever and moreover the graphic corruption was much much more serious! Again, I have tried different graphics drivers and also different graphics setting, but no success.
I was afraid this could be a hardware problem.
However, after reverting back my system to Windows 10 1511, everything works again great. No graphics issues. The PC is super fast. It is just great.
Is there an incompatibility with Windows 10 Anniversary update (1607) and the Intel HD 5500 graphics?
Any valuable feedback is highly appreciated. If you need more information, let me know.